DEMUX Display Panel Reset Circuit for OLED Accuracy
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Solution Overview
Problem
Current OLED display panels suffer from display errors due to inadequate demultiplexer (DEMUX) circuits and time sequences, where data signals cannot be written correctly, leading to errors.
Innovation Solution
A DEMUX display panel is designed with an array substrate and DEMUX switches, comprising N-type field-effect transistors, a first control signal generating circuit, and a second control signal generating circuit to generate and transmit control signals for resetting data lines before scanning, ensuring accurate data signal transmission to sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DEMUX circuits and time sequences are used in OLED display panels, then the device complexity is reduced, but display errors occur due to incorrect data signal writing caused by voltage potential differences between data lines
Solution Approach 1:
The patent applies preliminary action by introducing a reset phase before the normal data writing phase. During this reset phase, all data lines are precharged to a reference voltage level, ensuring that subsequent data signal writing occurs from a known, uniform voltage state. This preliminary resetting action eliminates voltage potential differences that would otherwise cause display errors, while maintaining a relatively simple DEMUX circuit structure.
2Reliability
If data lines are reset with low potential voltages before scanning, then display errors are prevented, but the time required for data signal writing increases
Solution Approach 1:
The patent implements periodic action by structuring the data signal writing process into distinct, repeating phases: a reset phase where all data lines are precharged to a reference voltage, followed by a normal data writing phase. This periodic alternation between reset and write operations ensures that each data line starts from a known voltage state, preventing display errors. The rhythmic, periodic nature of this process allows for optimized timing and efficient use of the display refresh cycle.
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
The solution effectively prevents display errors by resetting data lines with low potential voltages before scanning, ensuring correct data signal writing and reducing errors caused by voltage potential differences between data lines.
Implementation Method 1
The DEMUX switch comprises at least two first transistors and at least two second transistors; wherein an input terminal of the first transistor connects to the corresponding second data line, an output terminal of the first transistor connects to one of the corresponding data line and the corresponding sub-pixels, a gate of the first transistor connects to the first control signal generating circuit
Data Source
AI summary
A demultiplexer (DEMUX) display panel comprising an array substrate, a plurality of DEMUX switches, and a second control signal generating circuit which is connected to a second control signal input terminal and is configured to generate a second control signal. The second control signal is sent to the DEMUX switch before scanning each row of the sub-pixels to make the DEMUX switch transmit a reset signal to the corresponding first data lines through both of the data signal output terminals.