Anode Optical Pattern and Black Bank for Low-Reflectance Displays
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Solution Overview
Problem
Display devices suffer from issues such as narrow bezel design limitations and reflectance due to anode electrodes, leading to ring-shaped spots and increased visibility of non-light-emitting areas.
Innovation Solution
Incorporating a higher refraction material optical pattern on the anode electrode and a black-based bank to guide and absorb external light, reducing reflectance and preventing ring-shaped spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional anode electrode structure is used, then the display device can be manufactured with standard processes, but reflectance occurs and ring-shaped spots appear in non-light-emitting areas
Solution Approach 1:
The patent introduces an optical pattern layer as an intermediary component between the anode electrode and the bank. This optical pattern layer serves as a mediator that redirects external light toward the bank, preventing direct reflection from the anode electrode surface and eliminating ring-shaped spots in non-light-emitting areas while maintaining compatibility with standard manufacturing processes
Solution Approach 2:
The patent modifies the optical parameters of the anode electrode region by adding the optical pattern layer with specific refractive index properties. This changes the light interaction characteristics from direct reflection to guided redirection, thereby reducing reflectance and preventing ring-shaped spots without fundamentally altering the manufacturing process
2Shape
If the bezel width is reduced for a narrower design, then the aesthetic appeal improves, but crack propagation risk increases
Solution Approach 1:
The patent divides the bank structure into multiple functional segments: the light-blocking bank portion and the optical pattern layer. This segmentation allows the optical pattern to be specifically optimized for light management while the bank structure maintains mechanical integrity, enabling narrow bezel design without compromising crack resistance
Solution Approach 2:
The patent applies different material properties to different regions: the optical pattern layer uses higher refraction material specifically in the region where light redirection is needed, while the bank uses black-based material for light absorption. This localized optimization enables narrow bezel design with improved crack propagation resistance in critical areas
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 minimizes reflectance and prevents ring-shaped spots, enhancing the aesthetic appeal and functionality of display devices by reducing visibility of non-light-emitting areas.
Implementation Method 1
an optical pattern including a higher refraction material than a bank can be formed on an upper surface of an anode electrode overlapping the bank to guide external light reflected from the anode electrode to the bank
Implementation Method 2
a bank can include a black-based material to absorb external light guided to a bank
Data Source
AI summary
A display device according to one or more examples includes a substrate, a display area including a plurality of sub-pixels, a non-display area outside the display area, an anode electrode disposed in each of the sub-pixels on the substrate, a bank disposed on the anode electrode, located at a boundary between adjacent sub-pixels, and overlapping a periphery of an upper surface of the anode electrode, and an optical pattern disposed between the periphery of the upper surface of the anode electrode and the bank, wherein the bank includes a black-based material.