Stretchable Display Panel Voltage Compensation Layer

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Solution Overview

Problem

Stretchable OLED display panels face challenges in maintaining electrical properties when stretched, as the threshold voltage of transistors shifts, affecting carrier mobility and sub-threshold swing, leading to decreased driving ability and increased power consumption.

Innovation Solution

A stretchable display panel with a voltage compensation layer between the transistor and the base substrate, which applies a compensation voltage based on the stretching amount to mitigate the shift in threshold voltage, using a controller and memory to generate the necessary voltage from a reference table.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the display panel is stretched to meet flexible design requirements, then the adaptability and flexibility of the display panel are improved, but the threshold voltage of the transistor shifts, causing the electrical properties to deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoidelectrical properties

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by introducing a compensation voltage before the threshold voltage shift causes performance degradation. The compensation voltage is applied in advance based on detected stretching amount to counteract the expected negative effects of stretching on transistor electrical properties, thereby maintaining stable display performance during flexible deformation.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent implements feedback by using a detector to monitor the stretching amount of the display panel in real-time and using this information to adjust the compensation voltage dynamically. This closed-loop feedback mechanism ensures that the compensation voltage adapts to the actual stretching state, maintaining optimal electrical properties across different flexed configurations.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the threshold voltage of the transistor shifts during stretching, then the mechanical flexibility is improved, but the driving ability of the transistor decreases

Engineering Contradiction:

ImprovestretchabilityVSAvoiddriving ability

Core Design Contradiction:

Adaptability or versatilityVSPower

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the voltage parameter (compensation voltage) in response to stretching amount. By changing the voltage parameter based on the stretching state, the system compensates for threshold voltage shifts and maintains the transistor's driving ability across different mechanical configurations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses feedback to maintain driving ability by detecting the stretching amount and adjusting the compensation voltage accordingly. This ensures that the transistor's electrical characteristics remain stable despite mechanical deformation, preserving the driving capability needed for display operation.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If the threshold voltage of the transistor shifts during stretching, then the flexibility of the display panel is improved, but the power consumption increases

Engineering Contradiction:

ImproveflexibilityVSAvoidpower consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent applies preliminary anti-action by pre-applying a compensation voltage to counteract threshold voltage shifts before they cause increased power consumption. This proactive compensation prevents the need for higher operating voltages that would otherwise be required to maintain display performance, thereby avoiding additional power consumption.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent uses parameter changes by adjusting the compensation voltage parameter based on stretching amount to maintain efficient operation. By dynamically optimizing the voltage parameter, the system prevents power consumption increases that would result from uncompensated threshold voltage shifts.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11580888B2Stretchable display panel, method for compensating threshold voltage of transistor and computer readable storage medium

Publication Date: 2023.02.14 BOE TECHNOLOGY GROUP CO LTD

AI summary

A stretchable display panel, a method for compensating a threshold voltage of a transistor in the stretchable display panel, and a computer readable storage medium. The stretchable display panel includes: a base substrate; a transistor on the base substrate, the transistor includes a gate electrode layer and an active layer that are at least partially stacked; and a voltage compensation layer, the voltage compensation layer is located between the transistor and the base substrate, wherein the voltage compensation layer is applied with a compensation voltage that depends on a stretching amount of the stretchable display panel.