Light-Emitting Module Optics for Reducing Adjacent LED Mura
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Solution Overview
Problem
Existing light-emitting modules in electronic devices often suffer from visual mura due to brightness differences between adjacent light-emitting elements.
Innovation Solution
A light-emitting module design that includes a circuit substrate with a first light-emitting element and an optical pattern adjacent to it, both covered by a lens. This configuration aims to reduce brightness differences and improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lens is used to cover the light-emitting element, then the light extraction efficiency is improved, but the brightness difference between adjacent light-emitting elements increases causing visual mura
Solution Approach 1:
An optical pattern layer is introduced as an intermediary between the light-emitting element and the lens. This optical pattern layer includes light-transmitting portions positioned at light-emitting element positions and light-shielding portions positioned at intermediate regions between adjacent light-emitting elements. The light-shielding portions block stray light and reduce the brightness difference between adjacent light-emitting elements, while the light-transmitting portions allow the main light to pass through to the lens for efficient extraction.
Solution Approach 2:
The optical pattern layer applies different optical properties to different regions: light-transmitting portions are located at positions corresponding to light-emitting elements to maximize light extraction, while light-shielding portions are located at intermediate regions to reduce brightness differences. This local differentiation of optical properties resolves the contradiction between improving light extraction efficiency and reducing visual mura.
2Ease of manufacture
If the lens covers only the light-emitting element, then the manufacturing process is simple, but the brightness uniformity across adjacent elements is poor
Solution Approach 1:
The optical pattern layer is integrated with the lens structure, forming a combined optical component. The optical pattern layer is positioned between the light-emitting element and the lens, with its light-transmitting and light-shielding portions working together with the lens to achieve both brightness uniformity and efficient light extraction. This merging approach maintains manufacturing simplicity while improving brightness uniformity.
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
The proposed solution effectively reduces the brightness difference between adjacent light-emitting elements, thereby minimizing visual mura and enhancing the overall performance of the light-emitting module.
Implementation Method 1
a lens covering the first light-emitting element and the optical pattern
Data Source
AI summary
A light-emitting module is provided. The light-emitting module includes a circuit substrate and a first light-emitting element disposed on the circuit substrate. The light-emitting module also includes an optical pattern disposed on the circuit substrate and adjacent to the first light-emitting element. The light-emitting module further includes a lens covering the first light-emitting element and the optical pattern.