Demultiplexer Signal Routing for Display Scan Timing
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Solution Overview
Problem
Conventional display devices face challenges in achieving high resolution while ensuring sufficient supply time for scan signals, leading to issues with picture quality due to insufficient scan signal duration.
Innovation Solution
The proposed display device and driving method incorporate a demultiplexer with transistors that control data signals and initializing voltages, allowing for overlapping of data control signals with scan signals to extend the supply time of scan signals, and utilizing multiple transistors to manage different data signals and initializing voltages for each data output line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a demultiplexer is added to output lines of the data driver to lower manufacturing cost, then manufacturing cost is reduced, but the supply time of scan signals becomes insufficient leading to picture quality issues
Solution Approach 1:
The initializing voltage is supplied to the data output line in advance before the data signal is transmitted. This preliminary action ensures that the data output line is properly initialized and ready to receive the data signal, which helps maintain picture quality even when the scan signal supply time is limited due to the use of a demultiplexer
Solution Approach 2:
The data output lines are divided into multiple segments, each handled by separate transistors in the demultiplexer. This segmentation allows independent control of each data output line, enabling the scan driver to supply scan signals to different pixel rows at different times while maintaining proper signal timing and picture quality
2Duration of action of moving object
If data control signals are overlapped with scan signals to extend supply time, then supply time of scan signals is extended, but signal interference may occur
Solution Approach 1:
The demultiplexer acts as an intermediary between the data driver and the data output lines. It receives data signals from the data driver and selectively transmits them to different data output lines based on control signals. This intermediary structure allows the scan driver to extend the supply time of scan signals by controlling the timing of data signal transmission through the demultiplexer, while preventing direct signal interference between scan and data signals
Solution Approach 2:
The data control signals are timed to be supplied in advance of or overlapping with the scan signals in a controlled manner. This preliminary action allows the demultiplexer to be ready to receive and transmit data signals at the appropriate times, extending the effective supply time of scan signals while maintaining signal integrity through proper timing coordination
Data Source
AI summary
A display device includes a first pixel coupled to a scan line and a first data output line, a second pixel coupled to the scan line and a second data output line, a scan driver configured to supply a scan signal to the scan line, a data driver configured to supply a first data signal, a second data signal, and a first initializing voltage to a data input line, and a demultiplexer configured to receive the first data signal and the second data signal, to transmit the first data signal to the first data output line, and to transmit the second data signal and the first initializing voltage to the second data output line.