OLED Anode Overlap Layout for Uniform Column Capacitance
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Solution Overview
Problem
Existing technologies fail to efficiently address the issue of capacitance and capacitance, resulting in uneven display and uneven vertical stripes due to varying parasitic capacitance in OLED light-emitting devices.
Innovation Solution
The display module incorporates a design where the first-type anode unit and second-type anode unit are structured to partially overlap with different metal components, ensuring consistent capacitance across odd and even columns, thereby avoiding uneven display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the anode layer is designed with simple structure, then the manufacturing process is easier, but the capacitance between odd and even columns becomes uneven causing display defects
Solution Approach 1:
The anode layer is segmented into different types (first-type and second-type anode units) with different structures. The first-type anode unit has a simple structure while the second-type anode unit includes an extension portion that extends toward the signal line. This segmentation allows different regions of the display to have different capacitance characteristics, compensating for the inherent capacitance differences between odd and even columns caused by the LTPS circuit layout.
Solution Approach 2:
Different regions of the anode layer are given different local qualities through the extension portions. Specifically, the second-type anode units in even columns have extension portions that increase their capacitance with respect to the signal line, while the first-type anode units in odd columns maintain simpler structures. This local differentiation balances the overall capacitance across all columns, resolving the display uniformity issue.
2Device complexity
If the LTPS circuit is disposed at the lower side of OLED light-emitting area, then the circuit layout is simplified, but parasitic capacitance is generated causing uneven display
Solution Approach 1:
The invention converts the harmful parasitic capacitance effect into a beneficial compensation mechanism. By deliberately designing the anode layer structure to have different capacitance characteristics in different regions, the parasitic capacitance generated by the LTPS circuit layout is used to compensate for the capacitance differences between odd and even columns. The extension portions of the second-type anode units are specifically designed to increase capacitance in regions where it is needed, transforming the harmful parasitic effect into a useful compensation mechanism that achieves display uniformity.
Data Source
AI summary
A display module and a display device are provided. The display module includes array layers and light-emitting devices. One light-emitting device is located on a side of one corresponding array layer facing a light-emitting surface of the display module, and includes a source-drain metal layer which includes a first metal component and a second metal component. The light-emitting device includes an anode layer which includes a first-type anode unit disposed correspondingly to the first metal component and a second-type anode unit disposed correspondingly to the second metal component. The second-type anode unit includes a first body portion and a first sub-extension unit connected to each other. Along a thickness direction of the display module, the first metal component at least partially overlaps the first-type anode unit, and the second metal component at least partially overlaps the first sub-extension unit while does not overlap the first body portion.