Scan Driver Demultiplexer for OLED Data Line Reduction
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Solution Overview
Problem
Conventional organic light emitting display devices require a large number of data driver output lines, leading to increased manufacturing costs as the resolution and size of the display increase, due to the need for multiple data driving circuits to manage these lines.
Innovation Solution
The implementation of a scan driver and organic light emitting display device that reduces the number of data driver output lines by using a demultiplexer to distribute data signals from a single output line to multiple data lines, with a demultiplexer controller managing the switching elements to ensure efficient signal distribution during specific periods, and the use of shift registers to generate scan and light emitting control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple data driver output lines are used to supply data signals to multiple data lines, then data signal distribution is achieved, but the number of data driving circuits increases leading to increased manufacturing costs
Solution Approach 1:
A demultiplexer is introduced as an intermediary device between the data driver and data lines. The demultiplexer receives data signals from a single data driver output line and distributes them to multiple data lines through switching elements, thereby reducing the number of data driving circuits while maintaining proper signal distribution to all pixels
Solution Approach 2:
The demultiplexer enables a single data driver output line to serve multiple data lines simultaneously. By using switching elements controlled by control signals, the same output line can be dynamically connected to different data lines at different times, achieving multi-functionality and reducing the total number of driving circuits required
2Ease of manufacture
If the number of data driver output lines is reduced using a demultiplexer, then manufacturing costs decrease, but signal distribution timing and synchronization become more complex
Solution Approach 1:
Control signals are generated in advance to synchronize the switching elements with the data signal timing. The scan driver generates control signals that predetermine when each switching element should be activated, ensuring that data signals are routed to the correct data lines at the appropriate times without timing conflicts or synchronization errors
Data Source
AI summary
An organic light emitting display device includes a scan driver for supplying a first scan signal to a first scan line during a first period and a second period, a second scan signal to a second scan line during the second period, and a light emitting control signal to a light emitting control line during a period at least spanning the first and second periods. A data driver sequentially supplies data signals to an output line during the first period. A demultiplexer is electrically coupled to the output line, receives the data signals and supplies the data signals to data lines which are connected to pixels. Each pixel receives one of the data signals during the first period, compensates a threshold voltage of a driving transistor during the second period, and generates light with a brightness corresponding to the one of the data signals after the second period.