Light Emitting Panel Contact Layout for Uniform XR Luminance
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Solution Overview
Problem
Existing light emitting panels face challenges in achieving uniform luminance and high aperture ratio due to voltage drop issues, particularly in extended reality (XR) applications where multiple sub-pixels require efficient data voltage transmission.
Innovation Solution
The design includes a pixel electrode with a first side and a second side of differing lengths, connected through a plurality of contact holes, where the number of contact holes along the longer side exceeds those along the shorter side, and these contact holes are arranged to minimize overlap with the light emitting region, ensuring efficient data voltage transmission and reduced luminance non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple contact holes are arranged along the longer side of the pixel electrode to transmit data voltage, then voltage drop is reduced and luminance uniformity is improved, but the aperture ratio decreases due to increased contact hole overlap with the light emitting region
Solution Approach 1:
The patent applies local quality by differentiating the arrangement of contact holes along different sides of the pixel electrode. Specifically, more contact holes are arranged along the longer side (second side) than along the shorter side (first side), creating a non-uniform distribution that optimizes voltage transmission where needed while minimizing impact on the light emitting region. This localized optimization resolves the contradiction by concentrating contact holes in areas that require more voltage transmission paths without unnecessarily reducing the overall aperture ratio.
Solution Approach 2:
The patent employs asymmetry in the contact hole arrangement by creating an asymmetric distribution pattern where the number of contact holes along the second side (N2) is greater than the number along the first side (N1). This asymmetric arrangement is specifically designed to match the geometric asymmetry of the pixel electrode itself, optimizing the electrical connection without symmetrically reducing the aperture ratio across all sides, thus resolving the luminance uniformity versus aperture ratio contradiction.
2Area of stationary object
If the pixel electrode has a larger area to improve light emission, then aperture ratio increases, but voltage drop across the electrode increases causing non-uniform luminance
Solution Approach 1:
The patent applies segmentation by dividing the data voltage transmission path into multiple parallel pathways through the contact holes. Instead of relying on a single or few contact points, the pixel electrode is connected to the data line through multiple segmented contact holes distributed along its perimeter. This segmentation creates multiple parallel current paths that reduce the overall electrical resistance and voltage drop across the large-area pixel electrode, thereby maintaining luminance uniformity while preserving the large aperture ratio.
Solution Approach 2:
The patent transitions from a one-dimensional linear contact arrangement to a two-dimensional distributed arrangement of contact holes along the perimeter of the pixel electrode. By utilizing the dimensional space around the pixel electrode more effectively and arranging contact holes in a two-dimensional pattern rather than a single line, the patent reduces the electrical path length and voltage drop across the electrode while maintaining a large light emitting area, thus resolving the contradiction between aperture ratio and luminance uniformity.
Data Source
AI summary
A light emitting panel includes: a plurality of unit pixels, wherein each of the plurality of unit pixels includes a plurality of sub-pixels. Each of the plurality of sub-pixels includes a pixel electrode that includes a first side extending in a first direction and a second side that extends in a second direction. Each pixel electrode is electrically connected to one or more pixel circuits through a plurality of contact holes. The plurality of contact holes includes one or more first contact holes and a plurality of second contact holes, wherein the one or more first contact holes are arranged along the first side, and the plurality of second contact holes are arranged along the second side. The one or more pixel circuits is connected to one data line and can transmit the same data voltage to the pixel electrode through the plurality of contact holes.