Mini LED Drive Backplane Barrier Layout for Reflective Pad Clearance

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Solution Overview

Problem

The fluidity of white oil used in mini LED display technology makes it difficult to maintain effective coverage on the drive backplane, leading to lower light utilization and poorer light-emitting uniformity due to the risk of covering connecting components, which reduces conduction and soldering reliability.

Innovation Solution

A drive backplane design incorporating barriers embedded within a reflective layer on the periphery of connecting components, which reduces the fluidity of the ink material and prevents it from covering the connecting components, allowing for increased coverage area and improved reflectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the opening area of the white oil is increased to prevent covering connecting components, then the conduction and soldering reliability is improved, but the coverage area of the white oil on the drive backplane is reduced and the reflectivity is lowered

Engineering Contradiction:

Improveconduction and soldering reliabilityVSAvoidlight utilization

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent introduces a barrier layer as an intermediary substance between the white oil and the connecting components. This barrier layer prevents the white oil from covering the connecting components while allowing the white oil to maintain its proper opening area for optimal light reflection. The barrier layer acts as a mediator that resolves the conflict between preventing component coverage and maintaining light utilization.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

Engineering Contradiction:

Improvesoldering reliabilityVSAvoidcoverage area of white oil

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The barrier layer serves as an intermediary that enables the white oil to achieve both adequate coverage area and proper opening area. By placing the barrier layer around the connecting components, the white oil can extend closer to the components without directly covering them, thus increasing the coverage area while maintaining the necessary openings for reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of energy

If the white oil is printed closer to the pads to increase coverage, then the light utilization is improved, but the white oil easily covers the pads during flow process

Engineering Contradiction:

Improvelight utilizationVSAvoidconduction and soldering reliability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The barrier layer is applied in advance before the white oil printing process. This preliminary action creates a protective boundary that prevents the white oil from flowing onto and covering the connecting components during the printing and drying processes. The barrier layer is already in place to guide the white oil's flow and prevent harmful coverage.

Inventive Principle:

Principle #10Preliminary action

4Loss of energy

If the reflective layer covers a large area on the drive backplane, then the light utilization is improved, but the connecting components may be covered affecting soldering reliability

Engineering Contradiction:

Improvelight utilizationVSAvoidsoldering reliability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The reflective layer is segmented into regions with and without barriers. The barriers create distinct zones: areas where the reflective layer directly contacts the base substrate (providing maximum reflection) and areas where the barrier layer interven (protecting connecting components). This segmentation allows the reflective layer to cover a large area while maintaining reliability.

Inventive Principle:

Principle #1Segmentation

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 enhances light utilization and uniformity by maintaining high reflectivity and preventing dark regions between mini LEDs, while improving soldering yield and printing efficiency.

Implementation Method 1

white oil for reflecting light given off by the mini LEDs is coated on peripheral regions of the pads on the drive backplane

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 2

the barriers are disposed around the connecting components and the barriers are embedded in the reflective layer... reduces the fluidity of the ink material

Methodology Applied

Scientific EffectFluidity reduction:

Data Source

PatentUS20240162399A1Drive backplane and method for preparing same, light-emitting substrate and method for preparing same

Publication Date: 2024.05.16 GUANGZHOU CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A drive backplane and a method for preparing same, a light-emitting substrate and a method for preparing same. The drive backplane includes a driving substrate, a reflective layer, and a number of barriers, wherein the driving substrate includes a base substrate and connecting components disposed on the base substrate, and the connecting components are used to connect to light-emitting devices. The drive backplane can avoid a phenomenon that the reflective layer covers the connecting components, and the reflective layer covers a larger area on the drive backplane and reflectivity is relatively high.