Light-emitting Substrate with Dummy Units for Display Reliability
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Solution Overview
Problem
Mini-LED display technologies face issues with dark lights or loss of brightness when a single light-emitting element in a partition disconnects, affecting overall picture quality due to the series or series-parallel connection of light-emitting elements.
Innovation Solution
A light-emitting substrate with partitions featuring a first light-emitting unit and a dummy unit connected in parallel, where the dummy unit has an operating voltage greater than the light-emitting unit, ensuring that when a light-emitting element fails, the dummy element takes over to maintain brightness and prevent circuit disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light-emitting elements are connected in series or series-parallel to improve brightness and uniformity, then the luminous brightness and uniformity of each partition are improved, but when one light-emitting element is disconnected, the entire partition or multiple partitions cannot emit light, causing dark lights and loss of brightness
Solution Approach 1:
The patent applies preliminary action by pre-configuring dummy light-emitting elements in parallel with the series-connected light-emitting elements before any failure occurs. These dummy elements are designed with higher operating voltages so they remain inactive during normal operation but automatically activate when a primary element fails, preventing dark lights and maintaining brightness without requiring real-time detection or control systems.
Solution Approach 2:
The dummy light-emitting elements serve as intermediaries that take over the function of failed primary light-emitting elements. By connecting these dummy elements in parallel with higher operating voltages, they act as backup pathways that automatically engage when the primary path fails, ensuring continuous illumination and maintaining circuit reliability while preserving the series-parallel brightness enhancement.
2Reliability
If dummy light-emitting elements with higher operating voltages are connected in parallel to prevent dark lights, then the reliability and picture quality are improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making each partition independently equipped with its own dummy light-emitting elements rather than using a centralized backup system. This localized approach allows each partition to autonomously maintain its functionality upon element failure, improving reliability while keeping the added complexity confined to individual partitions rather than the entire display system.
Solution Approach 2:
The dummy light-emitting elements are designed as simple, passive backup components that are always present but only activate when needed. These elements are structurally identical to primary elements but with higher operating voltages, making them inexpensive additions that provide reliable backup functionality without requiring complex control mechanisms or expensive active components.
Data Source
AI summary
A light-emitting substrate and a display device are provided. The light-emitting substrate includes a plurality of partitions, and the partitions include a first light-emitting unit and a first dummy unit. The first light-emitting unit includes at least one light-emitting element. The first dummy unit is connected in parallel with the first light-emitting unit. The first dummy unit includes a dummy light-emitting element, and an operating voltage of the first dummy unit is greater than an operating voltage of the first light-emitting unit.