Organic Light Emitting Display Optical Path Control Layer
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Solution Overview
Problem
Conventional organic light emitting display apparatuses face limitations in improving luminescent efficiency and are prone to defects due to the structure of the organic emission layer between cathode and anode electrodes, and the patterning processes of thin films can damage the layers, leading to reduced performance and increased defect occurrence.
Innovation Solution
The proposed organic light emitting display apparatus includes a substrate with a color filter layer, a transflective reflective layer that partly transmits and reflects light, an optical path control layer with insulating materials, and a thin film transistor, which enhances luminescent efficiency by controlling light paths and prevents defects by eliminating the need for patterning, thereby reducing the risk of metal particle formation and etch selectivity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the organic emission layer is placed between cathode and anode electrodes with conventional structure, then the display device can emit light, but the luminescent efficiency is limited and defects occur
Solution Approach 1:
The patent introduces a new spatial dimension by placing a reflective layer at the bottom of the emission layer, creating a vertical microcavity structure. This dimensional change allows light to bounce between the top and bottom interfaces, increasing the optical path length and enhancing luminescent efficiency without requiring lateral expansion of the device structure.
Solution Approach 2:
The patent introduces an optical path control layer as an intermediary component between the emission layer and the reflective layer. This intermediary layer controls and directs the light path, enabling better light extraction efficiency while preventing direct contact between the reflective layer and other layers, thus reducing defect formation.
2Ease of manufacture
If thin films are patterned to form display structures, then the device can be manufactured, but the patterning process damages layers and creates metal particles
Solution Approach 1:
The reflective layer serves multiple functions simultaneously: it acts as a mirror to enhance light extraction, provides a structural base for the microcavity formation, and eliminates the need for complex patterning processes. This multi-functionality allows the device to be manufactured without damaging patternation steps while maintaining display performance.
Solution Approach 2:
The patent extracts and removes the problematic patterning process from the manufacturing sequence by using a continuous reflective layer that does not require patterning. This extraction of the harmful manufacturing step eliminates metal particle formation and layer damage while still achieving the desired display structure through the microcavity effect.
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 configuration significantly improves luminescent efficiency by amplifying light through microcavity effects and prevents defects by avoiding the patterning process, resulting in enhanced performance and reliability of the organic light emitting display apparatus.
Implementation Method 1
a transflective reflective layer formed on the color filter layer, and for partly transmitting and partly reflecting visible light
Implementation Method 2
an optical path control layer (OPCL) formed between the transflective reflective layer and the first electrode, for controlling a path of light generated in the intermediate layer
Implementation Method 3
When a voltage is applied to the cathode and anode electrodes, visible light is generated in the organic emission layer connected to the cathode and anode electrodes
Data Source
AI summary
An organic light emitting display apparatus includes a substrate, a color filter layer on the substrate, a transflective reflective layer on the color filter layer, the transflective reflective layer being configured to partly transmit and partly reflect visible light, a first electrode on the transflective reflective layer, an intermediate layer on the first electrode, the intermediate layer including an organic emission layer, a second electrode on the intermediate layer, and an optical path control layer (OPCL) between the transflective reflective layer and the first electrode, the OPCL including an insulating material and being configured to control a path of light generated in the intermediate layer.