OLED Transmission Area Insulating Structure for External Light Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience reduced contrast when exposed to bright external light, which can degrade the display quality and introduce noise in components like cameras due to external light propagation.
Innovation Solution
The implementation of a display device structure that includes a substrate with pixel circuits, insulating layers, pixel electrodes, and a second insulating layer with a colored material, which helps in reducing external light reflection and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a colored pixel definition layer is formed to improve contrast under external light, then a separate spacer formation process is required, which increases process complexity
Solution Approach 1:
The patent combines the pixel definition layer and spacer into a single integrated structure. The pixel definition layer is formed with protrusions that directly serve as spacers, eliminating the need for a separate spacer formation process while maintaining the contrast improvement function.
Solution Approach 2:
The pixel definition layer is designed to perform multiple functions simultaneously: it defines the pixel boundaries, provides color filtering to improve contrast, and its protrusions act as spacers to maintain electrode gaps. This multi-functionality reduces overall device complexity.
2Illumination intensity
If a colored pixel definition layer is formed to reduce external light reflection, then external light can still propagate to components like cameras, introducing noise
Solution Approach 1:
The patent applies different properties to different regions: the pixel definition layer with colored material is positioned in the display area to improve contrast, while additional light blocking structures are strategically placed in non-display areas to prevent external light from reaching sensitive components like cameras, addressing each region's specific requirements.
Solution Approach 2:
The patent introduces additional light blocking structures as intermediary elements between the external environment and sensitive components. These structures act as mediators that selectively block harmful light propagation while allowing the display function to operate normally.
3Ease of manufacture
If multiple separate processes are used to form pixel definition layer and spacer, then manufacturing complexity increases, but integrating them may compromise functional performance
Solution Approach 1:
The patent merges the pixel definition layer and spacer formation into a single manufacturing process step. The pixel definition layer is patterned with protrusions that inherently serve as spacers, simplifying manufacturing while maintaining the critical gap spacing function through the integrated structure's geometric design.
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 solution effectively reduces the degradation of display elements under external light, minimizes noise in components like cameras by reducing external light propagation, and simplifies the manufacturing process.
Implementation Method 1
a second insulating layer including a first portion covering an edge of each of the two pixel electrodes and a second portion adjacent to the first portion... the second insulating layer may include a colored pigment or a carbon black
Data Source
AI summary
A display device includes two pixel circuits spaced apart from each other with a transmission area therebetween, a first insulating layer on the two pixel circuits, two pixel electrodes on the first insulating layer, and a second insulating layer including a first portion covering an edge of each of the two pixel electrodes and a second portion, wherein the first insulating layer includes a third portion overlapping the two pixel electrodes, and a fourth portion having a height greater than a height from the substrate to a top surface of the third portion, wherein the first portion of the second insulating layer overlaps the third portion, and the second portion of the second insulating layer overlaps the fourth portion, wherein a height from the substrate to a top surface of the second portion is greater than a height from the substrate to a top surface of the first portion.