Charge Compensation Driver for Fast Data Line Voltage Convergence

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Solution Overview

Problem

Existing drivers for electro-optical devices face challenges in maintaining accurate data voltage during high pixel density and frame rate operations, leading to increased power consumption and circuit area due to the use of amplifier circuits for charge compensation.

Innovation Solution

A driver incorporating a data voltage output terminal, capacitor driving circuit, charge compensation circuit, and processing circuit to calculate and compensate for excess/deficient charge using a charge compensation capacitor circuit, allowing for faster and more efficient charge redistribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an amplifier circuit is used to compensate for excess or deficiency of charge, then charge compensation accuracy is improved, but power consumption and circuit area are increased

Engineering Contradiction:

Improvecharge compensation accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent changes the compensation mechanism from voltage-based (amplifier) to charge-based (capacitor). The charge compensation circuit uses a capacitor to directly inject or discharge compensation charge based on calculated excess/deficient charge amounts, avoiding the continuous power consumption of amplifier circuits while maintaining compensation accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent extracts the charge compensation function from the amplifier circuit and implements it separately using a dedicated charge compensation circuit with capacitor. This separation allows the amplifier to be turned off during compensation operations, eliminating its power consumption while preserving charge compensation capability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Speed

If the responsiveness of the amplifier circuit is increased, then charge compensation speed is improved, but power consumption and circuit area are increased

Engineering Contradiction:

Improvecharge compensation speedVSAvoidcircuit area

Core Design Contradiction:

SpeedVSArea of stationary object

Solution Approach 1:

The patent replaces the active amplifier-based compensation system with a passive capacitor-based system. The capacitor can charge and discharge rapidly without the physical limitations of amplifier bandwidth, achieving faster response speed with simpler circuitry and smaller area.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If pixel driving time is shortened to handle increase in number of pixels or frame rate, then productivity is improved, but charge compensation accuracy deteriorates due to delayed gradation voltage supply

Engineering Contradiction:

Improveframe rateVSAvoidgradation voltage accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent calculates the excess/deficient charge amount in advance based on precharge voltage and target gradation voltage before the data line switch is turned on. This preliminary calculation allows the charge compensation circuit to be ready to inject or discharge the exact compensation charge immediately when needed, ensuring accurate compensation even with shortened pixel driving time.

Inventive Principle:

Principle #10Preliminary action

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 proposed solution enables rapid convergence of data line voltages to target levels, reducing the need for additional amplifier circuits and minimizing power consumption and circuit size.

Implementation Method 1

a charge compensation circuit including a charge compensation capacitor circuit and configured to inject into the output node or discharge from the output node a compensation charge based on the excess/deficient charge amount calculated by the processing circuit, by using the charge compensation capacitor circuit

Methodology Applied

Scientific EffectCharge injection and discharge through capacitor circuit: Capacitance

Data Source

PatentUS12609092B2Driver for charge compensation, electro-optical device and electronic apparatus using thereof

Publication Date: 2026.04.21 SEIKO EPSON CORP

AI summary

A driver includes a data voltage output terminal electrically coupled to a data line through a data line switch of an electro-optical panel, a capacitor driving circuit configured to output first to nth capacitor driving voltages corresponding to gradation data to first to nth capacitor driving nodes, a capacitor circuit including first to nth capacitors provided between an output node and the first to nth capacitor driving nodes, a processing circuit configured to calculate an excess/deficient charge amount of the output node when the data line switch is turned on, and a charge compensation circuit configured to inject into the output node or discharge from the output node a compensation charge based on the excess/deficient charge amount calculated by the processing circuit, by using a charge compensation capacitor circuit.