OLED Display Subpixel Layout for Anode Flatness and Color Cast
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Solution Overview
Problem
Current OLED display substrates face challenges in achieving high-resolution designs with efficient light emission and reduced color cast phenomena due to overlapping orthographic projections of anode adapter portions and signal lines, which affect the flatness and symmetry of the anode, leading to suboptimal display performance.
Innovation Solution
The display substrate design includes a base substrate with multiple subpixels, each containing a pixel circuit and a light-emitting element, where the drive transistor's active layer is connected through a drive via hole, and anode adapter portions are strategically positioned to avoid overlapping with the drive active layer, ensuring the anode's main body portion overlaps only with signal lines, thereby maintaining flatness and reducing color cast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If anode adapter portions and signal lines are positioned in conventional layouts, then manufacturing is simplified, but the anode's flatness and symmetry deteriorate, causing color cast phenomena
Solution Approach 1:
The anode is divided into a main body portion and an auxiliary portion, with the auxiliary portion positioned at the end of the main body. This segmentation allows the anode adapter portions and signal lines to be strategically positioned relative to different segments, maintaining flatness and symmetry in the main body while accommodating necessary electrical connections through the auxiliary portion.
Solution Approach 2:
Different regions of the anode are assigned different functional qualities: the main body portion is optimized for flatness and symmetry to reduce color cast, while the auxiliary portion is positioned to provide necessary electrical connections. The anode adapter portions and signal lines are positioned to connect to specific local regions, allowing each part to optimize its local function without compromising overall performance.
2Measurement precision
If high-resolution design is implemented using SPR pixel arrangement, then display resolution is improved, but overlapping of anode adapter portions and signal lines with drive active layer occurs, affecting light emission efficiency
Solution Approach 1:
The problem is solved by transitioning from a two-dimensional planar layout consideration to a three-dimensional spatial arrangement. The anode adapter portions and signal lines are positioned in the planar view to avoid overlapping with the drive active layer, while the auxiliary portion extends to provide necessary connections. This spatial arrangement allows high-resolution SPR pixel arrangement to be implemented without the harmful overlapping effects.
3Ease of manufacture
If anode adapter portions overlap with drive active layer, then connection is simplified, but light emission efficiency and display performance deteriorate
Solution Approach 1:
The auxiliary portion of the anode acts as an intermediary element. It is positioned at the end of the main body portion and provides the necessary electrical connections between the anode adapter portions and the light-emitting element, without requiring the anode's main functional area to overlap with the drive active layer. This intermediary structure maintains both connection simplicity and light emission efficiency.
Data Source
AI summary
Embodiments of the present disclosure provide a display substrate and a display apparatus. The display substrate comprises: multiple repetition units, where at least one repetition unit includes multiple subpixels including first subpixels and second subpixels. In the first subpixel, an orthographic projection of an anode adapter portion on a base substrate does not overlap an orthographic projection of a drive active layer on the base substrate, and an orthographic projection of a main body portion on the base substrate does not overlap the orthographic projection of the anode adapter portion on the base substrate. In the second subpixel, an orthographic projection of an anode adapter portion on the base substrate overlaps an orthographic projection of a drive active layer on the base substrate, and an orthographic projection of a main body portion on the base substrate overlaps the orthographic projection of the anode adapter portion on the base substrate.