Capacitor Driving Sequence for Stable Data Output Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In capacitive driving of electro-optical panels, the resistance of input terminals interferes with charge movement, causing voltage fluctuations at the output terminal, which can exceed the power source voltage, leading to charge loss and driver malfunction.
Innovation Solution
A driver with a capacitor driving circuit that outputs voltages to nodes with capacitors, where the driving unit with the highest capacitance outputs its voltage first, followed by others, shifting the charge supply timing to prevent voltage spikes and maintain high-speed driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If capacitor charge redistribution is used to achieve high-speed driving, then pixel driving time is reduced, but voltage fluctuation exceeds power source voltage causing charge loss
Solution Approach 1:
The patent applies preliminary action by controlling the switching timing of capacitors in advance. Specifically, the switching unit switches on capacitors in a predetermined sequence from highest capacitance to lowest capacitance, rather than switching them simultaneously. This pre-planned sequential switching prevents voltage from exceeding the power source voltage during charge redistribution, thereby maintaining reliability while achieving high-speed pixel driving.
2Speed
If all capacitors switch on simultaneously for charge redistribution, then driving speed is maximized, but voltage rises above power source voltage causing diode conduction and charge loss
Solution Approach 1:
The patent applies segmentation by dividing the simultaneous switching action into multiple sequential steps. Instead of switching all capacitors at once, the switching unit divides them into groups based on capacitance magnitude and switches each group in sequence. This segmentation of the switching process allows charge redistribution to occur in controlled stages, preventing the voltage spike that would cause diode conduction and charge loss, while still maintaining high overall driving speed.
3Ease of operation
If capacitors with higher capacitance switch on later, then voltage control is simplified, but pixel driving time increases beyond acceptable limits
Solution Approach 1:
The patent applies parameter changes by optimizing the switching sequence based on capacitance values. The switching unit changes the switching timing parameter for each capacitor according to its capacitance magnitude, switching higher capacitance capacitors first and lower capacitance capacitors later. This parameter-based sequencing achieves effective voltage control during charge redistribution while keeping the total pixel driving time within acceptable limits for high-resolution displays.
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 approach suppresses voltage rises at the output terminal, preventing charge loss and ensuring stable data voltage delivery, even at high resolution and short pixel driving times.
Implementation Method 1
a capacitor circuit including first to tenth capacitors (C1 to C10) provided between first to tenth capacitor driving nodes (NDR1 to NDR10) and a data voltage output terminal (TVQ)
Data Source
AI summary
A driver and an electronic device include a capacitor driving circuit and a capacitor circuit having a plurality of capacitors provided between a plurality of capacitor driving nodes and a data voltage output terminal. The capacitor driving circuit has a plurality of driving units that output capacitor driving voltages, and in the case where a capacitance of one of the plurality of capacitors is the highest, after a driving unit that drives that capacitor has outputted a capacitor driving voltage, the next driving unit outputs the next capacitor driving voltage.