OLED Pixel Driving Circuit Signal Line Sharing for High PPI
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Solution Overview
Problem
Existing organic light-emitting display panels face challenges in achieving high pixel per inch (PPI) due to the large number of longitudinal wires required for data and reference voltage signal lines, which hinders the implementation of high PPI displays.
Innovation Solution
The proposed solution involves an organic light-emitting display panel with a pixel array configuration where adjacent pixel driving circuits share data and reference voltage signal lines, reducing the total number of signal lines needed, and a driving method that optimizes the supply of voltage and control signals to facilitate efficient operation and initialization of pixel driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each pixel driving circuit is assigned separate data voltage signal lines and reference voltage signal lines, then the reliability of voltage supply is improved, but the number of longitudinal wires increases, preventing high PPI implementation
Solution Approach 1:
Adjacent pixel driving circuits share common data voltage signal lines and reference voltage signal lines. Specifically, pixel driving circuits in the same column share a data voltage signal line, and pixel driving circuits in alternating columns share reference voltage signal lines (e.g., odd columns share one reference line, even columns share another), thereby reducing the total number of longitudinal wires while maintaining functional reliability
Solution Approach 2:
The shared data voltage signal lines and reference voltage signal lines serve multiple pixel driving circuits simultaneously. A single data voltage signal line provides data signals to multiple pixel driving circuits across different columns, and reference voltage signal lines provide stable reference voltages to multiple pixel driving circuits, making the signal lines multi-functional and reducing overall wire count
2Productivity
If the number of signal lines is reduced to enable high PPI, then the display density is improved, but the voltage drop and display unevenness increase
Solution Approach 1:
The display panel is divided into multiple columns, with each column's pixel driving circuits sharing data voltage signal lines. This segmentation allows the signal lines to be shorter and more manageable, reducing voltage drop effects while maintaining high display density. The column-based segmentation enables efficient signal distribution across the display panel
Solution Approach 2:
Pixel driving circuits share common reference voltage signal lines that provide stable reference potentials. By having multiple pixel driving circuits connected to the same reference voltage line, they maintain consistent potential levels, reducing display unevenness caused by voltage variations. The reference voltage lines act as equipotential pathways that stabilize the operating point of multiple pixel circuits
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 configuration reduces the number of data and reference voltage signal lines, enabling the fabrication of high PPI organic light-emitting display panels while minimizing power consumption and display unevenness caused by voltage drops.
Implementation Method 1
Organic light-emitting diode (OLED) displays are more and more widely applied in various kinds of portable electronic devices
Data Source
AI summary
An organic light-emitting display panel, driving method thereof, and an organic light-emitting display device are provided. The organic light-emitting display panel comprises a plurality of pixel driving circuits including a first, a second and a third pixel driving circuits along a row direction. The first and the second pixel driving circuits share a same reference voltage signal line. The second and the third pixel driving circuits share a same data voltage signal line. A plurality of reference voltage signal lines is connected to the plurality of pixel driving circuits. A plurality of data voltage signal lines is connected to the plurality of pixel driving circuits. A first control signal line is connected to the first and third pixel driving circuits. A second control signal line is connected to the second pixel driving circuit. A light-emitting control signal line is connected to the first, second, and third pixel driving circuits.