Wide-angle LED light source

Abstract

The invention relates to a wide-angle LED light source, comprising a base, an LED light-emitting chip and a lens. The LED light-emitting chip and the lens have the same central axis. The lens comprises a lower lens and an upper lens. The upper surface of the lower lens is a plane, and the lower surface thereof is hollowly formed to be a first cavity with a concave spherical surface along the central axis. The external surface of the upper lens is a curved surface, the included angle between the target line of each point on the curved surface and the incident ray of the point is smaller than or equal to 90 degrees. The middle of the upper lens is hollowly formed to be a semi-ellipsoidal second cavity along the central axis. A first ray diffusing surface is formed at the joint of the lower lens and the second cavity. The inner surface of the upper lens is a second ray diffusing surface, and the external surface of the upper lens is a third ray diffusing surface. The lens of the wide-angle LED light source provided in the invention has three ray diffusing surfaces so as to greatly improve refraction effect and light utilisation rate.

Description

technical field [0001] The invention relates to a light emitting diode (LED) light source, in particular to a wide-angle LED light source. Background technique [0002] Light-emitting diode backlight has many advantages: all-solid structure, good mechanical strength; low working voltage, long life; strong color performance, green environmental protection; short switching time, has been widely used as the back of mobile phones, LCD monitors and LCD TVs light source. Especially in the field of large-size LCD TVs, LED backlights have given full play to their characteristics: solid-state light sources are not as fragile as cold-cathode lamps (CCFLs); strong color expression can significantly enhance image quality; most importantly, because they are Point light source, easy to control the dynamic area drive to achieve energy saving and improve contrast. Due to the above advantages of LED itself, the future development trend is that LED backlights will replace CCFL backlights an...

AI Technical Summary

Problems solved by technology

In order to increase the astigmatism angle of the reflective part, the reflective part should be as large as possible, but if the reflective part is too large, the reflected light angle will be too large or even change the propagation direction by more than 90 degrees. At this time, the reflected light must pass through the backlight module side The reflection of the wall or the bottom surface is emitted from the vertical LCD plane, which greatly reduces the light efficiency and makes the LED lose the ability to be dynamically controlled in the area, which is not conducive to energy saving and improvement of contrast

Images