Reflective Shielding Layer for LED Brightness Uniformity

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Solution Overview

Problem

The challenge is to achieve good color saturation and brightness contrast in display devices while reducing the number of LED beads to lower manufacturing costs and improve economic competitiveness without compromising the ultra-thin design.

Innovation Solution

An LED device with a bracket structure, chip, and a reflective shielding layer on the packaging structure to uniformly distribute light intensity, allowing for a reduced number of LED devices and improved brightness uniformity, achieved by optimizing the light intensity distribution on the emergent surface with a reflective shielding layer covering part of the emergent surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the number of LED beads is reduced to lower manufacturing costs, then economic competitiveness is improved, but brightness uniformity and picture quality deteriorate

Engineering Contradiction:

Improvemanufacturing costVSAvoidbrightness uniformity

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

A reflective shielding layer is introduced as an intermediary component between the LED bead and the display panel. This layer reflects and shields light in specific directions, enabling effective light distribution with fewer LED beads, thereby reducing manufacturing costs while maintaining brightness uniformity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The reflective shielding layer applies local quality control by having different light reflection and shielding properties in different regions. The layer is designed with specific reflective shielding areas that target local light distribution needs, allowing precise control of brightness uniformity across the display panel

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the optical distance between LED light source points is increased to improve picture uniformity, then brightness uniformity is improved, but the thickness of the backlight module increases

Engineering Contradiction:

Improvepicture uniformityVSAvoidbacklight module thickness

Core Design Contradiction:

Illumination intensityVSLength of stationary object

Solution Approach 1:

The reflective shielding layer operates in a different dimensional space by controlling light distribution in the vertical and lateral dimensions through reflection and shielding, rather than relying solely on increasing horizontal optical distance. This allows achieving uniformity without proportionally increasing module thickness

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Illumination intensity

If more LED beads are used to improve color saturation and brightness contrast, then display quality is improved, but manufacturing cost increases

Engineering Contradiction:

Improvecolor saturation and brightness contrastVSAvoidmanufacturing cost

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The reflective shielding layer acts as a light control intermediary that enhances color saturation and brightness contrast by directing and regulating light distribution, achieving improved display quality without requiring an increased number of LED beads

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The reflective shielding layer changes the light distribution parameters through reflection and shielding effects, optimizing color saturation and brightness contrast by controlling light intensity and direction rather than increasing LED bead quantity

Inventive Principle:

Principle #35Parameter changes

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 solution enhances color saturation and brightness contrast, reduces the number of LED devices needed, lowers manufacturing costs, and allows for a thinner display device design, improving both economic competitiveness and practicality.

Implementation Method 1

a reflective shielding layer, the reflective shielding layer being provided on the packaging structure and the reflective shielding layer being at a central position of the emergent surface and covering part of the emergent surface to uniformly distribute a luminous intensity of the LED device along the emergent surface

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS11016340B2LED device, backlight module and display device

Publication Date: 2021.05.25 FOSHAN NATIONSTAR OPTOELECTRONICS CO LTD

AI summary

The disclosure provides a LED device, a backlight module and a display device. The LED device includes: a bracket structure and a chip, the bracket structure having a cup cavity and the chip being mounted in the cup cavity; a packaging structure, the packaging structure being provided on the bracket structure in a covering manner to seal the cup cavity and an upper surface, far away from the cup cavity, of the packaging structure forming an emergent surface; and a reflective shielding layer, the reflective shielding layer being provided on the packaging structure and the reflective shielding layer being at a central position of the emergent surface and covering part of the emergent surface. According to the disclosure, the problem in the related art that it is impossible to consider both a good color saturation and brightness contrast of a display of a display device is solved.