LED Package Light-Shielding Gel Body for Lateral Leakage Control

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Solution Overview

Problem

Existing LED package structures suffer from lateral light leakage, which affects the visibility and usability of portable electronic devices in dark environments, such as keyboards, leading to user discomfort and potential eye strain.

Innovation Solution

The method involves manufacturing an LED package structure with a light-emitting unit, a light-transmitting gel body, and a light-shielding gel body, where the light-transmitting gel body is formed to enclose the LED chip and has a second portion projected upwardly, and the light-shielding gel body fills the gap between the light-transmitting portions, preventing lateral light leakage by exposing only the light output surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a conventional LED package structure is used, then the light source can be simple and easy to manufacture, but lateral light leakage occurs which reduces visibility and causes eye strain

Engineering Contradiction:

Improvevisibility of indication lightVSAvoidlateral light leakage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The package structure is divided into distinct functional regions: a light-transmitting portion that allows light to pass through to the keycap, and a light-shielding portion that blocks lateral light leakage. This segmentation of the package body into zones with different optical properties effectively directs light forward while preventing harmful lateral leakage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the package structure are assigned different optical qualities - the light-transmitting portion has high transmittance to maximize light output to the user, while the light-shielding portion has high absorption or reflection properties to prevent lateral leakage. This local differentiation of material properties resolves the contradiction between visibility and light leakage control.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If light is emitted in all directions, then the LED chip can be simple without additional shielding structures, but lateral light leakage reduces device usability in dark environments

Engineering Contradiction:

Improvesimplicity of LED package structureVSAvoidusability in dark conditions

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light-shielding portion acts as an intermediary element between the LED chip and the external environment, selectively blocking light in lateral directions while allowing the light-transmitting portion to deliver light forward. This intermediary structure enables controlled light distribution without complicating the overall manufacturing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design effectively prevents lateral light leakage, enhancing the visibility of indication lights and improving user experience by ensuring that light is directed forward, reducing eye strain and improving device usability in dark conditions.

Implementation Method 1

a light-transmitting gel body (30) disposed on the circuit substrate (10) for enclosing the at least one LED chip (20), and the light-transmitting gel body (30) has a plurality of light-transmitting portions (30A, 30B)

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 2

a light-shielding gel body (40) disposed on the circuit substrate (10) for exposing the light output surface (300B) of the at least one second light-transmitting portion (30B)

Methodology Applied

Scientific EffectLight shielding: Absorption (EM radiation)

Data Source

PatentEP2851971B1LED package structures for preventing lateral light leakage and method of manufacturing the same

Publication Date: 2018.05.30 BRIGHTEK OPTOELECTRONIC CO LTD

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Figure 3A

AI summary

An LED package structure (Z) for preventing lateral light leakage includes a substrate unit (1), a light-emitting unit (2), a light-transmitting unit (3) and a light-shielding unit (4). The substrate unit (1) includes a circuit substrate (10). The light-emitting unit (2) includes at least one LED chip (20) disposed on the circuit substrate (10) and electrically connected to the circuit substrate (10). The light-transmitting unit (3) includes a light-transmitting gel body (30) disposed on the circuit substrate (10) for enclosing the LED chip (20). The light-transmitting gel body (30) has a first light-transmitting portion (30A) disposed on the circuit substrate (10) for enclosing the LED chip (20) and at least one second light-transmitting portion (30B) projected upwardly from the first light-transmitting portion (30A) and corresponding to the LED chip (20), and the second light-transmitting portion (30B) has a light output surface (300B). The light-shielding unit includes a light-shielding gel body (40) disposed on the circuit substrate (10) for exposing the light output surface (300B) of the second light-transmitting portion (30B).