Non-Uniform Pixel Electrode for Display Viewing Angle Consistency
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Solution Overview
Problem
Conventional organic light-emitting display apparatuses suffer from variations in image color coordinates when viewed from different angles, leading to inconsistent display quality.
Innovation Solution
The display apparatus features a substrate with a first pixel electrode having a non-uniform upper surface height and a data line configuration, where the first pixel electrode is positioned over an insulation layer, and conductive layers are strategically placed to minimize overlap and create chamfered lines, optimizing the angle of the pixel electrode's surface relative to the substrate for improved viewing angle consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional flat pixel electrode structure is used, then the manufacturing process is simple, but the display quality varies when viewed from different angles
Solution Approach 1:
The pixel electrode is designed with different heights at different locations (first portion higher than second portion), creating local quality variations that compensate for viewing angle-dependent optical effects. This non-uniform height structure ensures consistent color coordinates and luminance across different viewing angles.
Solution Approach 2:
The pixel electrode structure intentionally introduces asymmetry by positioning the first and second portions at different heights relative to the substrate. This asymmetric configuration counteracts the symmetric degradation that occurs in conventional flat electrodes when viewed from oblique angles.
2Area of stationary object
If the pixel electrode is positioned closer to the data line, then the device area is reduced, but the electrical interference and signal integrity may deteriorate
Solution Approach 1:
An insulation layer is introduced as an intermediary between the data line and the pixel electrode. This intermediate structure provides electrical isolation while allowing the pixel electrode to be positioned closer to the data line, thus reducing overall device area without compromising signal integrity.
Solution Approach 2:
The problem of electrical interference is solved by moving from a two-dimensional planar separation to a three-dimensional configuration using the insulation layer. This vertical dimensionality change allows horizontal proximity (reducing area) while maintaining electrical isolation (preserving reliability).
Data Source
AI summary
A display apparatus includes a substrate and a first pixel electrode disposed over the substrate, where a distance from a first portion of an upper surface of the first pixel electrode to an upper surface of the substrate is greater than a distance from a second portion of the upper surface of the first pixel electrode to the upper surface of the substrate.