Display Emission Circuit With Positive Feedback for Faster Turn-On

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Solution Overview

Problem

Current display technologies face challenges in achieving high brightness uniformity while minimizing power consumption and reducing driving voltage and raising/falling times.

Innovation Solution

A display driving device incorporating an emission circuit and a positive feedback circuit, where the emission circuit emits light based on inverse phase forward and reverse signals, and the positive feedback circuit discharges nodes using a sweep signal to accelerate turning on time and reduce raising time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a multi-emission design structure is used to achieve high brightness uniformity, then brightness uniformity is improved, but power consumption increases due to longer raising time and falling time

Engineering Contradiction:

Improvebrightness uniformityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent introduces a positive feedback circuit that uses the voltage at node N1 to accelerate the turning on process of the emission circuit. The feedback mechanism creates a regenerative effect where the rising voltage at N1 further accelerates the turning on, reducing the raising time and associated power consumption while maintaining brightness uniformity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes the voltage parameters dynamically during the emission cycle. By using different voltage levels (VSH, VSM, VSL for sweep signal and VR1, VR2, VR3 for reference signals) and adjusting them based on the emission phase, the circuit optimizes both brightness uniformity and power consumption characteristics

Inventive Principle:

Principle #35Parameter changes

2Speed

If the voltage level is raised to accelerate turning on time, then turning on speed is improved, but the raising time of emission current increases

Engineering Contradiction:

Improveturning on speedVSAvoidraising time of emission current

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent employs a sweep signal that rapidly transitions through different voltage levels (VSH→VSM→VSL) to quickly establish the emission current. This rushing through approach allows the circuit to skip intermediate slow transitions and achieve faster turning on while controlling the overall raising time through the structured voltage sequence

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS12626646B2Display driving device comprising an emission circuit and positive feedback circuit and display driving method

Publication Date: 2026.05.12 AU OPTRONICS CORP

AI summary

A display driving device includes an emission circuit and a positive feedback circuit. The emission circuit is coupled to a first node. The emission circuit emits light according to a forward signal, a reverse signal, and a voltage level of the first node. The forward signal and the reverse signal are inversed phase of each other. The positive feedback circuit discharges the first node according to sweep signal.