OLED Display Substrate Power Line Protrusion for Electrode Flatness
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Solution Overview
Problem
The existing display substrates for OLED displays face challenges in achieving optimal flatness of the lower electrode, which affects the luminous efficiency and display quality due to the unevenness of conductive layers below the electrode.
Innovation Solution
The display substrate incorporates a base substrate with subpixels arranged in an array, each equipped with a pixel circuit that includes a driving subcircuit, data write subcircuit, and compensation subcircuit. The substrate also features power lines with protrusions that are partially overlapped with the pixel electrodes, enhancing the flatness and stability of the pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional power line structures are used, then the manufacturing process is simple, but the flatness of pixel electrodes deteriorates due to uneven conductive layers
Solution Approach 1:
The power line structure is modified locally by adding protrusions at specific positions where pixel electrodes are located. This local modification approach improves the flatness of pixel electrodes without requiring a complete redesign of the entire power line structure, thus balancing manufacturing precision improvement with device complexity control.
Solution Approach 2:
The power line is transformed from a two-dimensional planar structure to a three-dimensional structure with protrusions extending in the vertical dimension. This dimensional change allows the power line to compensate for unevenness in the conductive layers below, improving pixel electrode flatness while maintaining overall structural simplicity.
2Manufacturing precision
If power lines are positioned away from pixel electrodes to reduce interference, then circuit interference is reduced, but the flatness of pixel electrodes deteriorates
Solution Approach 1:
The power line structure implements local quality differentiation by adding protrusions only at pixel electrode positions while maintaining separation in other areas. This allows the power line to be close to pixel electrodes where flatness is needed without causing excessive interference in other circuit regions.
Solution Approach 2:
The protrusion structure acts as an intermediary element that mediates between the power line and pixel electrode. It provides the necessary support for flatness while the insulating layer and controlled positioning serve as mediators to minimize electrical interference, thus resolving the contradiction between proximity benefits and interference risks.
3Manufacturing precision
If the power line protrusion is made larger to improve flatness, then pixel electrode flatness improves, but the risk of short circuit with connecting electrodes increases
Solution Approach 1:
The dimensions of the power line protrusion are precisely controlled within specific parameter ranges. The protrusion height and lateral dimensions are optimized to provide sufficient flatness improvement while maintaining safe clearance from connecting electrodes, thus balancing manufacturing precision with circuit reliability.
Solution Approach 2:
The power line structure implements local quality differentiation by adding protrusions only at pixel electrode positions while maintaining separation in other areas. This local modification approach improves the flatness of pixel electrodes without requiring a complete redesign of the entire power line structure, thus balancing manufacturing precision improvement with device complexity control.
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a base substrate and a plurality of subpixels provided on the base substrate. Each subpixel includes a pixel circuit. The plurality of subpixels include first subpixels. The display substrate further includes power lines. Each power line is configured to provide a first supply voltage for the corresponding first subpixels, the power line is provided on a side of the pixel electrode of the first subpixel near the base substrate, and the power line includes a power line main body and a power line protrusion protruded from the power line main body. The power line protrusion is at least partially overlapped with the pixel electrode of the first subpixel in a direction perpendicular to the base substrate. The display substrate can effectively improve the display quality.