Light emitting device having asymmetric light shape and manufacturing method thereof

Abstract

The invention provides a monochromatic light chip scale packaging light emitting device having asymmetric light shape. The device comprises a flip-chip LED chip and a reflecting structure and can also comprise a florescent structure so as to form a white light chip scale packaging light emitting device having the asymmetric light shape. The florescent structure comprises a florescent layer and a light transmitting layer, and the bottom surface at least covers the upper surface of the LED chip. The reflecting structure at least partially shields the vertical surface of the LED chip and the side surface of the florescent structure. The invention also provides a manufacturing method of the light emitting device. Therefore, the light emitting angle of the chip scale packaging light emitting device can be effectively limited in a specific direction so as to provide the asymmetric light shape, and thus the application requirements of asymmetric lighting or light source can be met without using additional optical lens and the application advantage of small size can also be maintained.

Description

[0001] 【Technical field】 [0002] The present invention relates to a light emitting device and a manufacturing method thereof, in particular to a chip scale packaging (CSP) light emitting device including a flip-chip LED chip and a manufacturing method thereof. [0003] 【Background technique】 [0004] LED (light emitting device) chips are commonly used to provide lighting sources or configured in electronic products as backlights or indicator lights, and LED chips are usually placed in a package structure and covered with a fluorescent material or reflective material Wrap or cover to become a light emitting device. [0005] Among them, the widely used bracket type (PLCC-type) LED can be divided into two categories according to the light emitting direction: top-view type and side-view type. Front-facing LEDs are widely used as light sources for general lighting or backlights for direct-lit LCD TVs, while side-facing LEDs are widely used as backlights for edge-lit LCD TVs and mo...

AI Technical Summary

Problems solved by technology

[0009] In terms of luminous characteristics, existing CSP LEDs can be divided into two types: top emitting and 5-surface emitting. Front emitting CSP LEDs use reflective materials to cover the four sides of the LED chip, and the light is only It is transmitted outward from the upper surface, so it has a small luminous angle (about 120°), and the light of the five-sided CSP LED can be transmitted outward from the upper surface and four sides, so it has a larger luminous angle (about 140°~ 160°), however, like bracket LEDs, these two types of CSP LEDs are both symmetrical light shapes, and cannot meet the application of asymmetric light shapes

In addition, for CSP LEDs, if a primary optical lens or a secondary optical lens is used to generate an asymmetric light shape, it will not only significantly increase the production cost, but also greatly increase the size of the CSP light-emitting device or its use. The space, so will lose the advantage of small size of CSPLED

However, the existing CSPLED still lacks an effective solution to achieve an asymmetric light shape.

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