OLED Pixel Circuit Dual Data Wiring Segmentation
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Solution Overview
Problem
As the resolution of organic light emitting display devices increases, the driving time of organic light emitting diodes decreases, leading to inefficiencies in data signal transportation and threshold voltage compensation, which affects image quality and display performance.
Innovation Solution
The implementation of a pixel circuit design with two data wirings corresponding to one pixel column, where the data signal of a pixel in an odd-numbered row and an even-numbered row are separated in time, allowing for overlapping of data writing and threshold voltage compensation actions, and a power supply wiring is placed between the data wirings to prevent coupling, while ensuring symmetrical active patterns between odd and even rows to maintain consistent electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display increases, then the image quality is improved, but the driving time of the organic light emitting diodes decreases
Solution Approach 1:
The pixel circuit is divided into two separate data wirings (first data wiring and second data wiring) that operate at different times. Even rows receive data signals through the first data wiring while odd rows receive data signals through the second data wiring, effectively segmenting the data writing process to extend the overall driving time for high-resolution displays
2Measurement precision
If the driving time is extended for data writing and threshold voltage compensation, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The first and second data wirings are merged into a single data signal transmission system that serves both even and odd rows. The same data signal is transmitted through different wirings at different times, combining the functionality of multiple wirings while maintaining a relatively simple overall structure
Solution Approach 2:
The data writing process uses periodic action by alternating between first data wiring and second data wiring for even and odd rows respectively. This periodic switching extends the total data writing time without requiring completely separate circuit paths, balancing complexity extension with structural simplicity
3Area of stationary object
If data wirings are placed adjacent to each other, then the area is reduced, but coupling effects occur between the data wirings
Solution Approach 1:
A power supply wiring is introduced as an intermediary element positioned between the first data wiring and the second data wiring. This power supply wiring acts as a shield that blocks electromagnetic coupling between the adjacent data wirings, preventing harmful interference while maintaining compact area usage
Data Source
AI summary
An organic light emitting display device includes a plurality of pixel columns, a first data wiring, a second data wiring, and a power supply wiring. The pixel columns include pixels repeatedly arranged in a first direction, and the pixel columns are repeatedly arranged in a second direction. The first and second directions are substantially perpendicular to each other. The first data wiring extends in the first direction and is connected to the pixels in an even row. The second data wiring extends in the first direction and are connected to the pixels in an odd row. The power supply wiring extends in the first direction between the first and second data wirings.