Light emitting diode source and manufacturing method thereof and backlight source with light emitting diode source

Abstract

The invention provides a light emitting diode source and a manufacturing method thereof and a backlight source with the light emitting diode source, belongs to the technical field of backlight sources of liquid crystal display devices, and solves the problem that an existing light emitting diode source is poor in light emitting uniformity. The light emitting diode source comprises a light emitting cup, fluorescent particles and a light emitting diode chip arranged in the light emitting cup. The light emitting diode source further comprises a light uniformizing structure arranged at the position higher than the light emitting diode chip. The light uniformizing structure comprises two light uniformizing surfaces arranged on the light emitting diode chip and along the length direction of the light emitting diode source. The light uniformizing surfaces extend diagonally and downwardly from the middle to the side along the light emitting diode source.

Description

[0001] This application requires the divisional application of the Chinese patent application submitted to the China Patent Office on September 27, 2010, with the application number 201010294536.0, and the title of the invention is "Light-emitting diode light source and its manufacturing method, and a backlight source with the same", the entire content of which Incorporated in this application by reference. technical field [0002] 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 [0003] 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 plura...

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Problems solved by technology

[0004] 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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