Double-Sided OLED Light Management via Segmented Reflective Layers
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Solution Overview
Problem
Current display devices, particularly organic light emitting display devices, face challenges in achieving efficient double-sided emission with complex manufacturing processes and limited control over light emission directions, which affects brightness and image quality.
Innovation Solution
A display device design featuring a substrate with distinct areas for front and rear light emission, utilizing a first and second organic layer with counter electrodes, an auxiliary layer, and an upper reflective layer, where the adhesive force between the upper reflective layer and the second counter electrode is greater than between the auxiliary layer and the upper reflective layer, allowing for enhanced light management and simplified manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a double-sided emission type OLED is designed to emit light from both front and rear simultaneously, then brightness and image quality are improved, but the manufacturing process becomes more complex and control over light emission direction becomes limited
Solution Approach 1:
The display device is divided into distinct first and second areas with separate pixel electrodes, organic layers, and counter electrodes. The auxiliary layer is selectively formed only on the first counter electrode in the first area, while the upper reflective layer is formed only on the second counter electrode in the second area. This segmentation allows independent optimization of front emission (first area) and rear emission (second area) structures, enabling double-sided emission while maintaining manageable manufacturing complexity through modular design
Solution Approach 2:
Different structural configurations are applied to different areas of the substrate. The first area has an auxiliary layer configuration optimized for front emission, while the second area has an upper reflective layer configuration optimized for rear emission. This local differentiation allows each area to have the specific properties needed for its emission direction, resolving the contradiction between achieving complex double-sided emission functionality and maintaining manufacturing simplicity
2Manufacturing precision
If the adhesive force between upper reflective layer and second counter electrode is made greater than between auxiliary layer and upper reflective layer, then light emission control is improved, but material selection and process control become more restrictive
Solution Approach 1:
The adhesive force parameter is deliberately controlled to create a specific hierarchy: the adhesive force between the upper reflective layer and second counter electrode is made greater than the adhesive force between the auxiliary layer and upper reflective layer. This parameter control enables the upper reflective layer to remain on the second counter electrode during manufacturing processes while allowing selective removal from the first area. This resolves the contradiction by establishing precise adhesive force relationships that enable both controlled light emission and manageable manufacturing
Solution Approach 2:
The auxiliary layer acts as an intermediary element that facilitates the selective formation and removal of the upper reflective layer. By controlling the adhesive forces through this intermediary layer, the patent enables precise control over where the upper reflective layer remains (second area) and where it can be removed (first area), achieving both manufacturing precision and ease of manufacture
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 design enables improved brightness and image quality by allowing simultaneous front and rear emission on a single display panel, simplifying the manufacturing process and improving light emission control.
Implementation Method 1
an upper reflective layer on the second counter electrode at the second area of the substrate
Implementation Method 2
light generated by combining positive holes and electrons each provided from an anode electrode and a cathode electrode in an organic layer
Data Source
AI summary
A display device and a method for manufacturing the same, the display device including a substrate that includes a first area and a second area; a first pixel electrode on the first area of the substrate; a first organic layer on the first pixel electrode, the organic layer including a first light emitting layer; a first counter electrode on the first organic layer; an auxiliary layer on the first counter electrode at the first area of the substrate; a second pixel electrode on the second area of the substrate; a second organic layer on the second pixel electrode, the second organic layer including a second light emitting layer; a second counter electrode on the second organic layer; and an upper reflective layer on the second counter electrode at the second area of the substrate.