Pixel Alignment Electrode Spacing for Uniform Light Emission
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Solution Overview
Problem
Display devices face challenges in achieving uniform light emission and alignment of light emitting elements due to non-uniform electric fields in the emission area, leading to reduced pixel performance.
Innovation Solution
The design incorporates a specific arrangement of alignment electrodes, where the distance between center alignment electrodes is narrower than between center and outer alignment electrodes, creating a uniform electric field and improving the alignment and emission uniformity of light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform spacing between all alignment electrodes is used, then device structure is simple, but light emission uniformity and alignment degree deteriorate
Solution Approach 1:
The patent applies local quality by making different regions of the alignment electrode structure have different spacing characteristics. Specifically, the first spacing between adjacent alignment electrodes in the first direction is different from the second spacing between adjacent alignment electrodes in the second direction. This non-uniform local spacing creates a uniform electric field distribution across the emission area, thereby improving the alignment degree and light emission uniformity without requiring complex additional components
Solution Approach 2:
The patent changes the geometric parameters of the alignment electrode arrangement by setting specific spacing ratios. The first spacing and second spacing are designed with specific relationships (e.g., first spacing is 1.5-2.5 times the second spacing) to optimize electric field uniformity. This parameter optimization enables uniform light emission while maintaining a relatively simple electrode structure without requiring additional complex components
2Manufacturing precision
If non-uniform electric field is present in emission area, then device structure is simple, but light emission uniformity deteriorates
Solution Approach 1:
The patent creates local quality variations in the electric field distribution by designing non-uniform spacing between alignment electrodes in different directions. The first spacing in the first direction and the second spacing in the second direction are deliberately made different to compensate for edge effects and achieve uniform electric field intensity across the entire emission area, thereby ensuring uniform light emission from light emitting elements
Solution Approach 2:
The patent employs asymmetry by making the spacing configuration asymmetric between different directions. The alignment electrodes are arranged with different spacings along the first direction versus the second direction, creating an asymmetric geometric configuration that produces a uniform electric field distribution. This asymmetric design effectively compensates for non-uniformities that would otherwise occur in symmetric arrangements
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 enhances the alignment degree of light emitting elements and achieves improved light emission uniformity across pixels, resulting in better display performance.
Implementation Method 1
a distance between the center alignment electrodes may be different from a distance between the center alignment electrodes and the outer alignment electrodes
Data Source
AI summary
A display device includes a plurality of pixels including alignment electrodes and light emitting elements disposed between the alignment electrodes, and the alignment electrodes including outer alignment electrodes and center alignment electrodes disposed between the outer alignment electrodes. A distance between the center alignment electrodes is different from a distance between the center alignment electrodes and the outer alignment electrodes.