OLED Pixel Electrode Openings With Light Blocking for Low Reflectance
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Solution Overview
Problem
Existing display devices face challenges in securing a reflection characteristic and improving efficiency, particularly when using a color filter, which affects the performance of organic light emitting display panels.
Innovation Solution
Incorporating first and second light blocking members in the display device, which are formed in the same process and disposed in the same layer, to overlap emission areas and non-emission areas respectively, thereby reducing reflectance and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light blocking members are added to reduce reflectance, then image quality improves, but device complexity increases
Solution Approach 1:
The light blocking members are integrated within the existing display device structure, nested between the emission areas and the color filters. This nesting approach allows the light blocking members to function within the existing device footprint without adding external complexity, while still achieving the goal of reducing reflectance and improving image quality.
Solution Approach 2:
The light blocking members are positioned in a specific spatial dimension within the display device stack, creating a new layer that blocks light paths without affecting the planar dimensions of the device. This dimensional approach allows light blocking functionality to be added without increasing the device's footprint or overall complexity.
2Productivity
If openings are created in pixel electrodes to overlap light blocking members, then light output efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The pixel electrode is segmented by creating openings that expose the underlying light blocking members. This segmentation allows light to pass through specific regions while maintaining the overall electrode structure, thereby improving light output efficiency without requiring complete redesign of the electrode system.
Solution Approach 2:
The openings in the pixel electrode are strategically positioned to overlap with the light blocking members, creating local variations in the electrode structure where light blocking is needed. This local quality approach allows precise control of light paths without affecting the entire electrode, reducing the overall manufacturing precision burden.
3Loss of energy
If reflectance is reduced through light blocking members, then efficiency improves, but device complexity increases
Solution Approach 1:
The light blocking members convert potentially harmful reflected light into beneficial effects by blocking it from reaching the color filters. This converts the harmful reflection that would otherwise reduce efficiency into a controlled light path management system, improving overall device efficiency while integrating the solution within the existing device architecture.
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 implementation of light blocking members lowers reflectance and improves the efficiency and image quality of the display device by minimizing external light reflection.
Implementation Method 1
light blocking members disposed on the encapsulation layer, wherein the light blocking members include first light blocking members overlapping the emission areas
Data Source
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AI summary
A display device includes a pixel circuit layer disposed on a substrate, pixel electrodes overlapping emission areas on the pixel circuit layer, light emitting layers respectively disposed on the pixel electrodes, a common electrode disposed on the light emitting layers, an encapsulation layer covering the common electrode, and light blocking members disposed on the encapsulation layer. The light blocking members include first light blocking members overlapping the emission areas, and second light blocking members overlapping a non-emission area between the emission areas, and the pixel electrodes have openings respectively overlapping the first light blocking members.