OLED Touch Sensor Organic Layer Adhesion and Viewing Angle Control
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Solution Overview
Problem
Current organic light emitting diode (OLED) display devices lack the ability to selectively control viewing angles, which is necessary for privacy and safety considerations, particularly in vehicle environments, and face challenges such as adhesion defects, undercut defects, and surface characteristic defects due to the thickness of the organic layer, affecting touch performance and luminance.
Innovation Solution
A display device structure is implemented with a substrate, light emitting diodes, an encapsulation layer, a touch sensor unit, and a lens layer, where the touch sensor unit includes an organic layer with a double-stepped structure and nano particles to enhance adhesion, and a multifunctional crosslinking agent to match the thermal expansion coefficient of the touch electrode, reducing parasitic capacitance and improving touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the organic layer is made thicker to improve adhesion, then adhesion strength is improved, but manufacturing precision deteriorates due to undercut defects and surface characteristic defects
Solution Approach 1:
The organic layer is designed with different thicknesses in different regions: a first organic layer with a first thickness in a first region and a second organic layer with a second thickness (greater than the first thickness) in a second region. This local quality variation allows the thicker second organic layer to provide enhanced adhesion strength where needed, while the thinner first organic layer maintains manufacturing precision and prevents undercut defects in other areas.
2Strength
If the organic layer is made thicker to improve adhesion, then adhesion strength is improved, but device complexity increases due to multiple layers
Solution Approach 1:
Instead of using a single uniform organic layer, the patent divides the organic layer into two distinct layers with different thicknesses and functional characteristics. The first organic layer provides a base structure, while the second organic layer with greater thickness provides enhanced adhesion. This segmentation allows each layer to be optimized for its specific function while maintaining overall structural integrity.
3Adaptability or versatility
If a lens layer is added to control viewing angle, then viewing angle control is improved, but device complexity increases
Solution Approach 1:
The patent combines the viewing angle control function with the existing organic layer structure by integrating a lens layer that works synergistically with the dual-thickness organic layers. The lens layer is positioned to work with the light emission characteristics of the organic layers, enabling viewing angle control without requiring a completely separate and complex optical system. This merging approach allows multiple functions (light emission, adhesion, and viewing angle control) to be achieved through an integrated structure.
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
The solution effectively controls viewing angles, enhances touch performance, and improves luminance by addressing adhesion and deposition defects, ensuring uniform touch electrode deposition and maintaining high aperture ratio.
Implementation Method 1
an organic layer with a double-stepped structure and nano particles to enhance adhesion
Implementation Method 2
a multifunctional crosslinking agent to match the thermal expansion coefficient of the touch electrode
Implementation Method 3
a lens layer on the touch sensor unit
Data Source
AI summary
A display device is disclosed. More particularly, the display device includes a touch sensor unit on the encapsulation layer of the display panel and a lens layer on the touch sensor unit, the touch sensor unit includes a plurality of bridge electrodes on the encapsulation layer, an organic layer on the bridge electrodes to expose at least a part of each of the plurality of bridge electrodes, and a touch electrode in contact with each of the plurality of exposed bridge electrodes, and the organic layer includes a first layer including a plurality of first contact holes which exposes at least a part of each of the plurality of bridge electrodes, and a second layer on the first layer and includes a plurality of second contact holes that each overlap a corresponding one of the plurality of first contact holes.