Top Bottom Emission MicroLED Display Light Blocking Layer

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Solution Overview

Problem

MicroLED display panels face issues with interference, color mixing, and non-uniform display due to the proximity of adjacent microLEDs and the use of opaque or reflective connecting wires, which affect contrast and luminous efficacy, especially in large-size or high-resolution displays.

Innovation Solution

The implementation of top emission and bottom emission microLED displays that include a light blocking layer and a light guiding layer to define emission areas and prevent interference, along with connecting structures to enhance contrast and uniformity, using techniques such as black matrix formation and ink-jet printing to optimize light distribution and connection patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If adjacent microLEDs are placed near to each other to increase resolution, then display resolution is improved, but interference and color mixing between adjacent microLEDs occur causing contrast ratio to decrease

Engineering Contradiction:

Improvedisplay resolutionVSAvoidinterference and color mixing

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

A light blocking layer is introduced as an intermediary element between adjacent microLEDs. This layer selectively blocks light from escaping laterally while allowing vertical light transmission, thereby preventing color mixing and interference between neighboring microLEDs without reducing display resolution

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The light blocking layer is applied locally between adjacent microLEDs rather than uniformly across the entire display. This localized approach prevents interference only where needed between microLEDs while maintaining high light extraction efficiency in the emission areas, thus preserving contrast ratio and resolution

Inventive Principle:

Principle #3Local quality

2Reliability

If opaque or reflective connecting wires are used to connect microLEDs, then electrical connection is achieved, but non-uniform display occurs and luminous efficacy decreases

Engineering Contradiction:

Improveelectrical connectionVSAvoidluminous efficacy

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The connecting structures are designed with optimized geometric parameters including width, shape, and distribution pattern. By changing these parameters, the structures provide sufficient electrical connection while minimizing their area to reduce light blocking effects, thereby maintaining luminous efficacy and display uniformity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The connecting structures are arranged in specific spatial patterns and orientations that optimize both electrical connectivity and light transmission. By utilizing dimensional arrangement rather than simply increasing material quantity, the design achieves reliable connections with minimal impact on luminous efficacy

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Area of stationary object

If the size of display panel is increased for large-screen applications, then display area is improved, but output loading and delay of drive circuits increase causing malfunction

Engineering Contradiction:

Improvedisplay areaVSAvoidoutput delay

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The display panel is segmented into multiple independent driving regions, each with its own drive circuit. This segmentation reduces the output loading and delay for each individual drive circuit while collectively covering a large display area, thereby preventing malfunction in large-screen applications

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

The solution effectively reduces interference and color mixing, enhances contrast and luminous efficacy, and prevents non-uniform displays, making it suitable for large-size or high-resolution microLED displays by controlling light emission and connection patterns.

Implementation Method 1

a first light blocking layer disposed on the bottom common electrode layer to define a plurality of emission areas

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

a light guiding layer disposed in the emission areas

Methodology Applied

Scientific EffectLight guiding: Waveguide (optics)

Implementation Method 3

a plurality of microLEDs disposed on the bottom common electrode layer

Methodology Applied

Scientific EffectLight emission from LED: Light Emitting Diode

Implementation Method 4

micro light-emitting diode (microLED, mLED or μLED) display panel

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11552127B2Top emission microLED display and bottom emission microLED display and a method of forming the same

Publication Date: 2023.01.10 PRILIT OPTRONICS INC

AI summary

A microLED display includes a first main substrate, microLEDs disposed above the first main substrate, a first light blocking layer disposed above the first main substrate to define emission areas, a light guiding layer disposed in the emission areas, and a plurality of connecting structures disposed in the emission areas respectively and electrically connected with the microLEDs.