Display Device Spacer Layer Segmentation for Leakage Current Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in enhancing the sensing performance for biometric information recognition, particularly in effectively distinguishing between light emitting elements and light receiving elements to minimize leakage currents and improve sensing accuracy.
Innovation Solution
The display device incorporates a spacer layer with an inverse taper shape and bridge grooves to disconnect the common layer between light emitting and light receiving elements, reducing leakage currents and enhancing sensing performance by preventing current flow to the light receiving elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common layer is shared between light emitting elements and light receiving elements, then device complexity is reduced and manufacturing is simplified, but leakage currents occur that degrade sensing performance
Solution Approach 1:
The common layer is segmented into separate regions: a first common layer region underlying light emitting elements and a second common layer region underlying light receiving elements. These regions are electrically isolated by disconnecting the common layer between the light emitting opening and the light receiving opening, preventing leakage currents while maintaining structural organization.
Solution Approach 2:
An intermediate layer is introduced between the common layer and the light receiving element. This intermediate layer includes a through hole that exposes the light receiving element, allowing electrical connection while physically separating the common layer from the light receiving element to prevent direct current leakage paths.
2Manufacturing precision
If the common layer extends continuously across both light emitting and light receiving elements, then manufacturing precision requirements are reduced, but leakage currents increase due to continuous current paths
Solution Approach 1:
The continuous common layer is divided into discrete segments: a first common layer region and a second common layer region, separated by gaps or discontinuities. This segmentation breaks the continuous current path, eliminating leakage currents while maintaining ease of manufacturing through standard layer deposition processes.
3Area of stationary object
If light receiving elements are positioned close to light emitting elements for compact design, then device area is reduced, but leakage currents increase due to shorter isolation distances
Solution Approach 1:
An intermediate layer is positioned between the common layer and the light receiving element, serving as a physical mediator that provides electrical isolation. This intermediate layer includes a through hole that allows the light receiving element to be positioned close to light emitting elements for compact design while preventing direct current leakage through the common layer.
Data Source
AI summary
A display device includes a base layer, a circuit layer disposed on the base layer, and an element layer disposed on the circuit layer and including a plurality of light emitting elements and a light receiving element disposed between the light emitting elements. The element layer includes a pixel definition layer including a plurality of light emitting openings, each overlapping a corresponding light emitting element, and a light receiving opening overlapping the light receiving element, and a spacer layer disposed on the pixel definition layer and including a spacer opening and a bridge groove connected to the spacer opening and exposing a top surface of the pixel definition layer. The display device further includes a common layer commonly included in the light emitting elements and the light receiving element and partially disconnected by the spacer layer.