OLED Pixel Circuit Voltage Stabilization for Crosstalk Reduction

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Solution Overview

Problem

In display devices with Organic Light Emitting Diode (OLED) technology, particularly in Full Display with Camera (FDC) regions, signal crosstalk between long transparent traces leads to Mura-class display defects, which worsen with increasing resolution and refresh rate.

Innovation Solution

The implementation of a pixel circuit that includes a drive sub-circuit, writing sub-circuit, reset sub-circuit, voltage stabilizing sub-circuit, storage sub-circuit, and a light emitting element, where the voltage stabilizing sub-circuit stabilizes the anode terminal voltage of the light emitting element, preventing interference from adjacent transparent traces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the display resolution and refresh rate are increased, then the display quality is improved, but signal crosstalk between transparent traces worsens

Engineering Contradiction:

Improvedisplay qualityVSAvoidsignal crosstalk

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a voltage stabilizing sub-circuit as an intermediary component between the transparent traces and the light emitting element. This sub-circuit includes a stabilizing capacitor that acts as a mediator to filter and stabilize the voltage signal, preventing high-frequency noise and crosstalk from affecting the display quality while maintaining high resolution and refresh rates.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The voltage stabilizing sub-circuit is designed to preemptively counteract signal crosstalk by stabilizing the voltage before it reaches the light emitting element. The stabilizing capacitor is configured to counterbalance the coupling capacitance between adjacent transparent traces, providing prior cushioning against the harmful crosstalk effects that would otherwise degrade display quality at high resolutions.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Illumination intensity

If transparent traces are used to improve light penetration, then the penetration rate is improved, but signal interference between traces increases

Engineering Contradiction:

Improvepenetration rateVSAvoidsignal interference

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The voltage stabilizing sub-circuit serves as an intermediary that decouples the transparent traces electrically while maintaining their optical transparency. The stabilizing capacitor blocks high-frequency signal interference between adjacent transparent traces while allowing the traces to maintain their low-light-transmission characteristics for high penetration rate.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If the length of transparent traces is increased to cover larger areas, then the coverage is improved, but signal crosstalk between traces increases

Engineering Contradiction:

ImprovecoverageVSAvoidsignal crosstalk

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The voltage stabilizing sub-circuit is strategically placed at critical points along the transparent traces to provide localized voltage stabilization. This intermediary component effectively segments the long traces into smaller electrical sections, reducing the cumulative crosstalk effect while maintaining the overall large area coverage of the display.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Device complexity

If conventional pixel circuits are used to simplify the structure, then the device complexity is reduced, but Mura-class display defects occur

Engineering Contradiction:

Improvecircuit structureVSAvoiddisplay uniformity

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The pixel circuit is segmented into functional sub-circuits, with the voltage stabilizing sub-circuit being a distinct module. This segmentation allows the stabilizing function to be independently optimized without significantly increasing overall complexity, while effectively preventing Mura-class defects caused by voltage fluctuations and signal crosstalk in conventional integrated designs.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12236871B2Pixel circuit and driving method thereof, display panel and display device

Publication Date: 2025.02.25 MIANYANG BOE OPTOELECTRONICS TECH CO LTD

AI summary

A pixel circuit comprises a drive sub-circuit (101), writing sub-circuit (102), reset sub-circuit (103), voltage stabilizing sub-circuit (104), storage sub-circuit (105) and light emitting element. The drive sub-circuit is configured to provide a driving current to the light emitting element under control of signals of a first node (N1) and a second node (N2); the writing sub-circuit is configured to write a signal from a data signal terminal (Data) to N2 under control of signal of a scan signal terminal (Gate); the storage sub-circuit is configured to store a voltage of N1; the voltage stabilizing sub-circuit is configured to stabilize a voltage of an anode terminal of light emitting element through signal of a voltage stabilizing signal terminal (V1); the reset sub-circuit is configured to reset anode terminal of light emitting element under control of signal of Gate and reset N1 under control of signal of a reset control signal terminal (Reset).