OLED Reset Voltage Control for Frame-Based Charge Removal

Solution Overview

Problem

Existing OLED pixel circuits require a constant high reset voltage to eliminate charge accumulation, leading to high power consumption, heat generation, and reliability issues with TFT characteristics and OLED materials.

Innovation Solution

A reset voltage control circuit that dynamically adjusts the reset voltage based on brightness information, timing, or brightness differences of frames to optimize power consumption and reduce charge accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a constant high reset voltage is applied to eliminate charge accumulation, then charge removal effectiveness is improved, but power consumption increases and heat generation occurs

Engineering Contradiction:

Improvecharge removal effectivenessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by transitioning from a static constant reset voltage to a dynamic variable reset voltage that changes based on frame brightness characteristics. The reset voltage is adjusted frame-by-frame according to the maximum brightness value, making the system adaptive rather than fixed, thereby reducing unnecessary high voltage application and lowering power consumption while maintaining effective charge removal when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the reset voltage parameter based on brightness information. Instead of using a fixed voltage level, the reset voltage parameter is dynamically changed according to the maximum brightness value of each frame, allowing the system to optimize between charge removal effectiveness and power consumption by adjusting this critical parameter in response to actual display conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a constant high reset voltage is applied to eliminate charge accumulation, then charge removal effectiveness is improved, but heat generation increases affecting TFT and OLED reliability

Engineering Contradiction:

Improvecharge removal effectivenessVSAvoidheat generation

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent applies dynamics by transitioning from a static constant reset voltage to a dynamic variable reset voltage that changes based on frame brightness characteristics. The reset voltage is adjusted frame-by-frame according to the maximum brightness value, making the system adaptive rather than fixed, thereby reducing unnecessary high voltage application and lowering power consumption while maintaining effective charge removal when needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements parameter changes by modifying the reset voltage parameter based on brightness information. Instead of using a fixed voltage level, the reset voltage parameter is dynamically changed according to the maximum brightness value of each frame, allowing the system to optimize between charge removal effectiveness and power consumption by adjusting this critical parameter in response to actual display conditions.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a constant high reset voltage is applied, then charge accumulation is eliminated, but transient afterimages may still occur due to hysteresis

Engineering Contradiction:

Improvecharge removal effectivenessVSAvoidtransient afterimages

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies feedback by using brightness information from each frame to adjust the reset voltage for the next frame. This closed-loop approach where output (brightness) influences input (reset voltage) allows the system to respond to actual display conditions and adjust charge removal intensity accordingly, preventing both over-resetting and under-resetting that cause transient afterimages.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies dynamics by transitioning from a static constant reset voltage to a dynamic variable reset voltage that changes based on frame brightness characteristics. The reset voltage is adjusted frame-by-frame according to the maximum brightness value, making the system adaptive rather than fixed, thereby reducing unnecessary high voltage application and lowering power consumption while maintaining effective charge removal when needed.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12394371B2Reset voltage control circuit

Publication Date: 2025.08.19 FOCALTECH ELECTRONICS LTD

AI summary

A reset voltage control circuit provides at least one reset voltage to an OLED panel. The OLED panel is driven to display at least one frame, and each frame has a plurality of pixels and corresponds to a reset voltage. The OLED panel performs OLED on state reset according to the reset voltage, wherein the reset voltage is dynamically generated according to the plurality of pixels of the frame.