Display Device Curved Dummy Layer for Side-View Color Visibility
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Solution Overview
Problem
Existing display devices face challenges in improving image quality, particularly in terms of color reproduction and efficiency of light emission, which affect overall display performance.
Innovation Solution
The display device incorporates a dummy layer with a round cross section, featuring reverse-tapered and forward-tapered side surfaces, which is integrated with a light emitting layer and electrodes, along with a color filter and light blocking pattern to enhance image quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional pixel structure is used, then the device structure is simple, but color visibility at side viewing angles is poor
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode and second pixel electrode) separated by the dummy layer. This segmentation allows different electrode portions to emit light at different angles, improving color visibility from side viewing angles while maintaining a relatively simple overall structure.
Solution Approach 2:
The dummy layer acts as an intermediary structure between the pixel defining layer and the light emitting layer. It serves multiple functions: preventing lateral leakage currents, supporting the light emitting layer, and enabling the segmented electrode structure that improves side viewing angle performance.
2Reliability
If the light emitting layer is continuous, then the device structure is simple, but lateral leakage currents occur
Solution Approach 1:
The dummy layer is extracted as a separate functional element from the continuous light emitting layer structure. It is positioned between the pixel defining layer and the light emitting layer to specifically address lateral leakage currents without requiring complex modifications to the light emitting layer itself.
Solution Approach 2:
The dummy layer serves as an intermediary barrier that prevents lateral leakage currents between adjacent pixels while maintaining the simplicity of the overall device structure. It provides electrical isolation without requiring complex electrode or layer designs.
3Use of energy by moving object
If the dummy layer has a flat cross section, then the manufacturing process is simple, but light emission efficiency is reduced
Solution Approach 1:
The dummy layer is designed with a curved cross section (round or oval) rather than a flat cross section. This curvature optimizes the optical path and light emission efficiency by reducing light trapping effects, while the curvature can be achieved through standard photolithography and etching processes.
Solution Approach 2:
The cross-sectional shape parameter of the dummy layer is changed from flat to curved (round/oval). This parameter change improves light emission efficiency by optimizing light extraction, while the manufacturing process remains relatively simple by adjusting photolithography patterns and etching conditions.
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 improves color visibility at side viewing angles and extends the life of the display device by optimizing light emission and reducing lateral leakage currents.
Implementation Method 1
electrons and holes provided from the two electrodes may be recombined in the light emitting layer to generate excitons. As the generated excitons change from an excited state to a ground state, light may be emitted
Implementation Method 2
the color conversion element may receive blue light from the organic light emitting diode and emit blue, green and red light
Data Source
AI summary
A display device includes: a substrate; a first electrode on the substrate; a pixel defining layer on the first electrode; a dummy layer on the pixel defining layer; a light emitting layer on the first electrode and the dummy layer; and a second electrode on the light emitting layer, wherein at least one side surface of the dummy layer has a round cross section.