Display Metal Line Segmentation with Pulsed Voltage for Pixel Leakage
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Solution Overview
Problem
The increasing pixel density in display devices for augmented, virtual, and mixed reality applications leads to issues with leakage currents through common layers between adjacent pixels, which can cause damage.
Innovation Solution
A display device design that includes a metal line intersecting the non-display area and display area, with a voltage applied in pulses to prevent leakage currents, using sub-metal lines and separate voltage application to adjacent sub-pixels to manage heat and prevent sublimation of organic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more pixels are disposed on a small display screen to implement AR, VR, and MR, then the pixel density is improved, but the leakage current through the common layer between adjacent pixels increases
Solution Approach 1:
The common layer is divided into multiple separate metal lines (first metal line and second metal line) that are spatially separated by a distance. This segmentation prevents direct electrical connection between adjacent pixels while maintaining the common layer function, thereby eliminating leakage current without reducing pixel density.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first metal line and the second metal line. This insulating layer prevents electrical leakage between the separated metal lines while allowing each line to function independently, solving the leakage problem while preserving high pixel density.
2Object-generated harmful factors
If voltage is applied to prevent leakage current, then the leakage current is reduced, but heat generation may cause sublimation of organic materials
Solution Approach 1:
A pulsed voltage is applied to the metal lines rather than continuous voltage. The voltage is applied in periodic pulses that are sufficient to prevent leakage current but limited in duration and magnitude to control heat generation, preventing sublimation of organic materials while maintaining effective leakage prevention.
Solution Approach 2:
The voltage parameters (amplitude and duration of pulses) are optimized to achieve the minimum necessary voltage for preventing leakage current while keeping heat generation within safe limits. By adjusting these parameters, the system prevents leakage without causing excessive temperature rise that would sublime organic materials.
3Device complexity
If metal lines are disposed close to emission areas to reduce spacing, then the device complexity is reduced, but the risk of leakage current and heat damage to adjacent pixels increases
Solution Approach 1:
The metal lines are segmented into multiple separate lines with insulating layers between them, allowing the lines to be positioned close to emission areas without direct contact. This segmentation maintains simple spacing arrangement while preventing leakage current and heat damage to adjacent pixels through the insulating barrier.
Solution Approach 2:
The insulating layer serves as a mediator that allows metal lines to be disposed close to emission areas while preventing electrical leakage and heat transfer to adjacent pixels. This intermediary enables tight spacing for simple device structure while maintaining pixel reliability through electrical isolation.
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
Prevents leakage currents and damage to adjacent pixels by managing heat through controlled voltage application, ensuring high pixel reliability and efficient operation.
Implementation Method 1
a voltage including a plurality of pulses is applied to the metal line, and is increased by a step voltage value for each of the plurality of pulses
Implementation Method 2
using sub-metal lines and separate voltage application to adjacent sub-pixels to manage heat and prevent sublimation of organic materials
Data Source
AI summary
A display device includes a display area and a non-display area, sub-pixels disposed in the display area, and a metal line intersecting the non-display area and the display area and spaced apart from emission areas of the sub-pixels on a plane in the display area, and a voltage including pulses is applied to the metal line, and is increased by a step voltage value for each of the pulses.