Organic Light Emitting Display Pixel Gap Differentiation
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Solution Overview
Problem
In organic light emitting displays, the close arrangement of control lines leads to signal interference due to parasitic capacitance, degrading display quality.
Innovation Solution
The solution involves differentiating the gaps between contact metals and data lines in pixels, along with varying the sizes and overlapping areas of pixel electrodes, to reduce parasitic capacitance and optimize signal interference, while maintaining equal area occupation by pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If control lines are arranged adjacent to each other in high-resolution display, then display resolution is improved, but signal interference between control lines increases
Solution Approach 1:
The patent applies local quality by differentiating the gaps between contact metals and data lines in different pixels. Specifically, pixels are divided into first pixels and second pixels, where first pixels have a first gap between contact metal and data line, while second pixels have a second gap that is larger than the first gap. This local differentiation reduces parasitic capacitance and signal interference in specific pixel locations, thereby resolving the contradiction between maintaining high display resolution and reducing signal interference between closely arranged control lines.
2Object-affected harmful factors
If pixel electrodes are made different in size to reduce parasitic capacitance, then signal interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent employs asymmetry by making pixel electrodes in first pixels have a first area while pixel electrodes in second pixels have a second area that is larger than the first area. This asymmetric design allows different pixels to have different parasitic capacitance characteristics, thereby reducing signal interference. The asymmetric pixel electrode areas are compensated by adjusting the gap sizes between contact metals and data lines, which balances the overall pixel circuit areas and maintains manufacturability despite the asymmetric electrode design.
Data Source
AI summary
An organic light emitting display apparatus includes a first pixel and a second pixel. The first pixel includes a first data line, a first driving thin film transistor (TFT), and a first contact metal connected to the first driving TFT and in a layer at a same level as a layer of the first data line. The second pixel includes a second data line, a second driving TFT, and a second contact metal connected to the second driving TFT and in a layer at a same level as a layer of the second data line. The first gap between the first driving TFT and the first contact metal is different from a second gap between the second driving TFT and the second contact metal.