Display Device Crosstalk Inhibition via Insulating Layer Depression
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Solution Overview
Problem
High-resolution display devices, particularly those for virtual and augmented reality, face challenges in inhibiting crosstalk between adjacent electroluminescence (EL) elements due to difficulty in thickness control of the light-emitting layer, leading to unwanted light emission from non-desired EL elements.
Innovation Solution
A display device structure is implemented with a first insulating layer having a depression and a projection, a light-emitting device positioned over the projection, and a stack with a charge-generation layer, where the second insulating layer includes a protruding portion overlapping the depression, and the light-emitting device features a light-emitting layer and upper electrodes, with the stack material matching the light-emitting layer, to isolate adjacent light-emitting devices and prevent crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-emitting layer thickness is increased to inhibit crosstalk, then crosstalk is reduced, but manufacturing precision becomes difficult to control
Solution Approach 1:
An insulating layer is introduced as an intermediary structure between adjacent light-emitting devices. This insulating layer includes a depression region positioned between the light-emitting devices and a projection region that protrudes toward the light-emitting layer, physically isolating adjacent devices and preventing current leakage without requiring precise thickness control of the light-emitting layer itself.
Solution Approach 2:
Instead of controlling crosstalk through vertical thickness adjustment of the light-emitting layer, the invention introduces a horizontal dimension solution by creating a depression region in the insulating layer between adjacent devices. This dimensional shift moves the isolation mechanism from thickness control to spatial positioning, eliminating the need for precise thickness uniformity.
2Reliability
If the light-emitting layer is made thicker to prevent current leakage, then crosstalk is inhibited, but device complexity increases
Solution Approach 1:
The insulating layer with its depression and projection structures serves as a mediator that separates adjacent light-emitting devices. This intermediary structure provides physical isolation and current path definition without requiring modifications to the light-emitting layer itself, maintaining structural simplicity while achieving reliable current containment.
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 structure effectively inhibits crosstalk, enhancing display device performance by reducing leakage current and maintaining high luminance and contrast while minimizing power consumption.
Implementation Method 1
When current flows through the EL element including a light-emitting layer, light is emitted from the light-emitting layer
Data Source
AI summary
A display device in which crosstalk is inhibited is provided. The display device includes a first insulating layer including a first region and a second region having a lower top surface level than the first region, a second insulating layer including a region overlapping with the first region, a light-emitting device including a region overlapping with the first region with the second insulating layer therebetween, a stack including a region overlapping with the second region, and a third insulating layer including a region overlapping with the stack; the second insulating layer includes a protruding portion overlapping with the second region; the light-emitting device includes at least a light-emitting layer, a first upper electrode over the light-emitting layer, and a second upper electrode over the first upper electrode; the second upper electrode includes a region overlapping with the third insulating layer; and the stack contains the same material as the light-emitting layer.