Display Substrate Electrode Layout for Reduced Viewing-Angle Color Cast
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving uniformity and reducing color cast due to the complexity of the manufacturing process, particularly when using inkjet printing for forming light-emitting functional layers, which can lead to non-uniformity and color deviations across different viewing angles.
Innovation Solution
The display substrate design includes specific geometric relationships and configurations of sub-pixels, electrode plates, and conductive structures to minimize color cast by controlling the distances and overlaps between electrode edges and openings, along with precise alignment of conductive elements to ensure uniform light emission across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inkjet printing is used to form light-emitting functional layers, then manufacturing complexity is reduced, but display uniformity and color consistency deteriorate
Solution Approach 1:
The patent applies local quality by creating different electrode plate configurations for different sub-pixel types (red, green, blue). Each sub-pixel has specifically designed electrode plates with different sizes and positions relative to the pixel openings, allowing each color to compensate for its specific color cast issue while maintaining overall display uniformity
Solution Approach 2:
The patent changes geometric parameters of the electrode plates (size, position, shape) to control the capacitance distribution and electric field characteristics. By adjusting these parameters, the invention optimizes the compensation effect for color cast while maintaining manufacturing simplicity through inkjet printing
2Reliability
If electrode plates are positioned closer to pixel openings to improve capacitance, then storage capacity increases, but color cast worsens
Solution Approach 1:
The patent introduces asymmetry in the electrode plate design where the electrode plates are intentionally positioned at different distances from the pixel openings depending on the sub-pixel type. This asymmetric configuration creates different capacitance values for different colors, which compensates for the color cast by adjusting the charge storage characteristics specific to each color channel
Solution Approach 2:
Each color sub-pixel has locally optimized electrode plate positioning and dimensions. The red, green, and blue sub-pixels have different electrode configurations tailored to their specific color cast characteristics, allowing each to achieve optimal storage capacity without uniform color cast
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
The proposed design effectively reduces color cast and enhances display uniformity by maintaining consistent chromaticity coordinates across different viewing angles, improving the overall display quality and reducing manufacturing complexity.
Implementation Method 1
a light-emitting element including a first electrode, a second electrode, and a light-emitting functional layer between the first electrode and the second electrode
Data Source
AI summary
Provided are a display substrate and a display device. The display substrate includes: a base substrate and a plurality of sub-pixels on the base substrate; each sub-pixel includes: a pixel circuit including a storage capacitor including a first electrode plate and a second electrode plate; a light-emitting element; and a pixel definition layer. The sub-pixels include a plurality of openings, orthographic projections of the opening and the second electrode plate on the base substrate are overlapped; the second electrode plate includes a first edge and a second edge extending in the first direction; the opening includes a first edge and a second edge extending in the first direction; the first edge of the second electrode plate is closer to the first edge of the opening; the second edge of the second electrode plates is closer to the second edge of the opening.