OLED Display Driver Circuit Sharing Data Lines
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays require a large number of integrated circuits to drive data lines, leading to reduced aperture efficiency due to the need for driving circuits for each red, green, and blue pixel within a limited display area.
Innovation Solution
The OLED display employs a driver system that divides a frame into multiple fields, allowing two pixels to share a data line and a scan line, with each pixel group emitting in a specific field, reducing the number of driving circuits and data lines required, and incorporating non-emitting pixels between emitting pixels to eliminate vertical stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driving circuits are used for each data line, then each pixel can be driven independently, but the number of integrated circuits increases and aperture efficiency decreases
Solution Approach 1:
The patent merges the driving functions for multiple data lines into a single integrated circuit. The driver circuit sequentially selects different data lines using scan lines and controls multiple pixels sharing common data lines, reducing the number of integrated circuits from one per data line to a single shared driver circuit.
Solution Approach 2:
The driver circuit is designed with universal functionality to control multiple data lines and pixel groups through sequential scanning. A single driver circuit can drive different combinations of pixels by activating different scan lines and controlling data line selections, making it multi-functional rather than dedicated to a single data line.
2Ease of operation
If driving circuits are included for each pixel in the display area, then pixel control is achieved, but the aperture efficiency is reduced due to occupied display area
Solution Approach 1:
The patent segments the pixel array into groups that share common data lines and scan lines. By dividing pixels into manageable groups controlled by combinations of scan lines and data lines, the system achieves pixel control without requiring individual driving circuits for each pixel within the display area.
Solution Approach 2:
The patent introduces an additional control dimension by using scan lines as a second selection mechanism alongside data lines. This creates a two-dimensional addressing scheme where pixels are selected by the intersection of specific scan lines and data lines, enabling control without increasing the physical footprint of driving circuits within the display area.
3Manufacturing precision
If pixels are arranged densely to maximize display area, then resolution improves, but vertical stripe artifacts appear due to shared data lines
Solution Approach 1:
The patent employs periodic scanning of data lines through sequential activation of scan lines. By systematically cycling through different data line combinations in a periodic manner, the system distributes the shared data line usage across different time periods, preventing the formation of persistent vertical stripe artifacts while maintaining high pixel density.
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
This approach reduces the number of integrated circuits needed for data line driving, increases aperture efficiency, and improves display definition by eliminating vertical stripes and optimizing pixel arrangement.
Implementation Method 1
an organic light emitting diode (OLED) display is a device in which lights are emitted by exciting phosphorus organic compounds
Data Source
AI summary
A display device includes a display area having a plurality of data lines, a plurality of first scan lines, a plurality of second and third scan lines, and a plurality of pixel areas. In addition, the display device includes a first driver, a second driver, and a third driver. At least two pixels sharing a data line and a first scan line are formed in at least one of the pixel areas. At least one of the pixels of a first group among the pixels formed in the at least one pixel area is emitted by a first emission signal in a first field, and at least another one of the pixels of a second group are emitted by a second emission signal in a second field.