OLED Demultiplexer Segmentation for Scan Timing
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Solution Overview
Problem
Existing organic light emitting displays face challenges in operating at high resolution due to increased data input periods and reduced scan periods, leading to potential errors.
Innovation Solution
The proposed solution involves an organic light emitting display device with a pixel unit, scan driver, data driver, and demultiplexer block unit that demultiplexes signals efficiently, allowing direct connection of second output lines to second data lines, and includes a timing controller to manage scan and data signals, ensuring sufficient scan periods and accurate signal charging to storage capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a demultiplexer is used to reduce the number of output lines of a data driver, then the number of output lines is reduced, but the data input period increases and the scan period decreases
Solution Approach 1:
The pixel array is divided into two separate groups: first pixels (red and blue) connected to first data lines through demultiplexers, and second pixels (green) connected to second data lines directly. This segmentation allows different scanning schemes for different pixel groups, enabling sufficient scan periods for all pixels while maintaining reduced output line count.
Solution Approach 2:
The patent introduces a dual-scan-driver architecture with separate scan drivers for first scan lines and second scan lines. By adding this dimensional separation in the scanning mechanism, the system can independently control scan periods for different pixel groups, resolving the time loss issue while maintaining the reduced output line structure.
2Device complexity
If a demultiplexer is used to reduce the number of output lines of a data driver, then the number of output lines is reduced, but errors may occur due to insufficient scan period
Solution Approach 1:
The pixel array is divided into two separate groups: first pixels (red and blue) connected to first data lines through demultiplexers, and second pixels (green) connected to second data lines directly. This segmentation allows different scanning schemes for different pixel groups, enabling sufficient scan periods for all pixels while maintaining reduced output line count.
Solution Approach 2:
The patent introduces a dual-scan-driver architecture with separate scan drivers for first scan lines and second scan lines. By adding this dimensional separation in the scanning mechanism, the system can independently control scan periods for different pixel groups, resolving the time loss issue and ensuring reliable operation without errors.
3Device complexity
If three data signals are sequentially supplied to each output line through a demultiplexer, then the number of output lines is reduced, but the data input period increases
Solution Approach 1:
The pixel array is divided into two separate groups: first pixels (red and blue) connected to first data lines through demultiplexers, and second pixels (green) connected to second data lines directly. This segmentation allows different scanning schemes for different pixel groups, enabling sufficient scan periods for all pixels while maintaining reduced output line count.
Solution Approach 2:
The timing controller is configured to supply scan signals and data signals in a specific sequence: first scan signals are supplied after control signals to allow proper timing of demultiplexing operations. This preliminary coordination of signal timing ensures that data input periods are sufficient even with the reduced output line architecture.
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 enables high-resolution operation without errors by reducing the number of output lines and ensuring adequate scan periods, improving the display's performance compared to traditional methods.
Implementation Method 1
an organic light emitting diode (OLED) generating light by recombination of electrons and holes
Data Source
AI summary
An organic light emitting display device includes: a pixel unit including first pixels positioned at intersection parts between first data lines and first scan lines and the second pixels positioned at intersection parts between the second data lines and the second scan lines; a scan driver sequentially supplying first scan signals to the first scan lines and sequentially supplying second scan signals to the second scan lines; a data driver supplying first output signals to first output lines and supplying second output signals to second output lines; and a demultiplexer block unit including demultiplexers which demultiplex the first output signals in response to control signals, respectively, and supply the demultiplexed signals to the first data lines, wherein the second output lines are directly connected to the second data lines.