Transparent LED Electrode Layout to Block Rear Light Leakage

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Solution Overview

Problem

In transparent LED displays using micro-LEDs, light emitted from the LEDs leaks to the rear of the transparent substrate through gaps between electrodes, reducing the display's transparency.

Innovation Solution

The LEDs are arranged on both surfaces of the transparent substrate, with electrodes on one surface shielding light paths from LEDs on the opposite surface to prevent light leakage, and reflective members can be used to enhance light utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If LEDs are arranged on one surface of the transparent substrate, then the display structure is simple, but light leaks to the rear surface through gaps between electrodes

Engineering Contradiction:

Improvedisplay structureVSAvoidlight leakage

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent transitions from a single-sided LED arrangement to a dual-sided arrangement, adding another dimension to the display structure. LEDs are mounted on both the front and rear surfaces of the transparent substrate, with electrodes configured to shield light paths from both sides, thereby preventing light leakage while maintaining structural simplicity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent converts the potentially harmful light that would leak through gaps between electrodes into a beneficial component by using reflective members. These reflective members redirect the light that would otherwise leak to the rear surface back toward the front surface, improving overall light utilization efficiency while preventing harmful leakage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If aperture ratio is increased to improve transparency, then more background light can be received, but light leakage from LED gaps becomes more problematic

Engineering Contradiction:

ImprovetransparencyVSAvoidlight leakage

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent uses reflective members to convert the harmful light leakage into a beneficial effect. The reflective members redirect light that would otherwise leak to the rear surface back toward the front surface, improving light utilization efficiency while maintaining high transparency through increased aperture ratio

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The reflective members act as intermediary elements between the LED light source and the transparent substrate. These intermediaries capture the light that would leak through electrode gaps and redirect it, preventing harmful leakage while preserving the high transparency achieved through increased aperture ratio

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 configuration effectively prevents light leakage to the opposite surface of the transparent substrate, enhancing transparency and aperture ratio, while improving light utilization efficiency.

Implementation Method 1

each of the electrodes on the second surface is arranged in a second surface shielding region including a region that shields a light path extending from one of the LEDs arranged on the first surface through the transparent substrate

Methodology Applied

Scientific EffectLight shielding: Absorption (EM radiation)

Implementation Method 2

each of the electrodes on the first surface is arranged in a first surface shielding region including a region that shields a light path extending from the LEDs on the second surface through the transparent substrate

Methodology Applied

Scientific EffectLight shielding: Absorption (EM radiation)

Data Source

PatentUS20250359419A1Transparent LED display

Publication Date: 2025.11.20 ALPS ALPINE CO LTD

AI summary

A transparent LED display includes a transparent substrate, pairs of electrodes arranged in an array on the transparent substrate, LEDs each arranged between a corresponding one of the pairs of electrodes, and apertures provided on the transparent substrate, the apertures being areas free of the electrodes and allowing light to pass through, wherein the LEDs are arranged on both of a first surface and a second surface of the transparent substrate, and each of the electrodes on the second surface is arranged in a second surface shielding region including a region that shields a light path extending from one of the LEDS arranged on the first surface through the transparent substrate, and each of the electrodes on the first surface is arranged in a first surface shielding region including a region that shields a light path extending from the LEDs on the second surface through the transparent substrate.