Electro-optical Panel Demultiplex Driving Leakage Error Reduction
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Solution Overview
Problem
Demultiplex driving in electro-optical devices suffers from writing errors due to leakage current, which worsens with increased demultiplexing times, limiting the ability to enhance pixel density without introducing display irregularities.
Innovation Solution
A circuit device with a selection signal output circuit and a data line driving circuit that performs demultiplex driving with a rewriting operation after the initial sequences, where selection signals are activated to rewrite data signals on the most affected data lines, reducing leakage current-induced errors and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of demultiplexing times is increased to enhance pixel density, then the pixel density is improved, but the writing error caused by leakage current becomes larger
Solution Approach 1:
The patent applies preliminary action by pre-charging all data lines before demultiplexing operation. A precharge voltage is applied to all data lines through switches being turned on simultaneously, ensuring that data lines are properly initialized before sequential selection. This preliminary charging compensates for potential voltage drops and reduces writing errors caused by leakage current during subsequent demultiplexing operations.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the voltage levels on data lines during demultiplexing. When a data line is selected, its voltage is changed from the precharge voltage to the data signal voltage. Additionally, the patent changes the timing parameters by holding switches in the on-state longer than traditionally required, allowing sufficient time for voltage stabilization and reducing the impact of leakage current on writing accuracy.
2Use of energy by moving object
If the number of driving amplifiers is decreased to lower power consumption, then the power consumption is reduced, but the ability to compensate for leakage current effects is weakened
Solution Approach 1:
The patent applies preliminary action by pre-charging all data lines before demultiplexing operation. A precharge voltage is applied to all data lines through switches being turned on simultaneously, ensuring that data lines are properly initialized before sequential selection. This preliminary charging compensates for potential voltage drops and reduces writing errors caused by leakage current during subsequent demultiplexing operations.
Solution Approach 2:
The patent implements continuity of useful action by maintaining switches in the on-state for an extended period after data signal writing. This continuous conduction allows the data signal to be firmly established on the selected data line, compensating for leakage current effects without requiring additional high-power driving amplifiers. The extended on-state ensures reliable voltage maintenance throughout the demultiplexing sequence.
Data Source
AI summary
A circuit device includes: a selection signal output circuit configured to output a selection signal based on first to fourth driving sequences in demultiplex driving, and a data line driving circuit configured to output first to fourth data signals to a data signal supply line in order of the first to fourth driving sequences. In the first driving sequence, the selection signal output circuit activates an i-th selection signal, and the data line driving circuit outputs an i-th data signal to an i-th data line. At this stage of operation, after the first to fourth driving sequences, a rewriting operation in which the selection signal output circuit activates the i-th selection signal, and the data line driving circuit outputs the i-th data signal to the i-th data line is performed.