Asymmetric Data Conductor for Display Viewing Angle Uniformity
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Solution Overview
Problem
Self-emissive light emitting display devices face color changes when the viewing angle is altered due to the protrusion-depression shape of electrodes, which affects the uniformity of light emission.
Innovation Solution
The design includes a data conductor with inclined surfaces and a passivation layer with protrusions and depressions, where the diode first electrode also has a protrusion-depression shape, overlapping the partition wall's opening, and the areas of the inclined surfaces are carefully balanced to maintain consistent light reflection across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electrode has a protrusion-depression shape, then the light emitting display device achieves self-emission characteristics with reduced thickness and weight, but color changes occur when the viewing angle is altered
Solution Approach 1:
The data conductor is designed with asymmetric inclined surfaces where the area of the first inclined surface differs from the area of the second inclined surface. This asymmetric configuration compensates for the viewing angle dependency caused by the protrusion-depression shape of the electrode, maintaining color consistency across different viewing angles while preserving the self-emissive luminance characteristics
2Ease of manufacture
If the data conductor has inclined surfaces with different areas, then color changes are reduced when viewing angle is adjusted, but the device complexity increases
Solution Approach 1:
The asymmetric inclined surfaces are implemented only in the specific region where the data conductor overlaps with the partition wall opening, rather than throughout the entire conductor structure. This localized application of asymmetric geometry achieves viewing angle uniformity while minimizing overall device complexity and maintaining simplicity in other regions
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 reduces color changes when the viewing angle is adjusted, enhancing the display's viewing angle without compromising image quality or causing luminance differences between pixels.
Implementation Method 1
the areas of the inclined surfaces are carefully balanced to maintain consistent light reflection across viewing angles
Data Source
AI summary
A light emitting display device includes: a substrate; a semiconductor layer disposed on the substrate; a first insulating layer disposed on the semiconductor layer; a first gate conductor disposed on the first insulating layer; a second insulating layer disposed on the first gate conductor; a second gate conductor disposed on the second insulating layer; an interlayer insulating layer disposed on the second gate conductor; a data conductor disposed on the interlayer insulating layer; a passivation layer disposed on the data conductor; a diode first electrode disposed on the passivation layer; a partition wall disposed on the diode first electrode and including an opening overlapping the diode first electrode; a light emitting layer; and a diode second electrode. The data conductor includes a first inclined surface and a second inclined surface, and an area of the first inclined surface is different from an area of the second inclined surface.