OLED Light-Emitting Control Circuit Degradation Compensation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Organic light-emitting diode (OLED) display panels face degradation due to long-time continuous light-emitting, requiring sub-pixels to be compensated to maintain display quality.

Innovation Solution

A light-emitting control circuit comprising two sub-circuits, each with a detection control unit and a light-emitting output unit, is used to manage the light-emitting process. These sub-circuits are connected to detection control terminals, clock signal terminals, voltage signal terminals, and nodes, allowing for controlled transmission of voltage signals to output terminals, thereby regulating the operation currents of sub-pixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If sub-pixels continuously emit light to maintain display operation, then display functionality is maintained, but light-emitting devices deteriorate over time

Engineering Contradiction:

Improvedisplay operation continuityVSAvoidlight-emitting device durability

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The patent implements periodic compensation operations by alternating between first and second light-emitting control sub-circuits in different frame cycles. This periodic switching allows one sub-circuit to compensate for degradation while the other operates, maintaining continuous display functionality while systematically addressing device deterioration through regular maintenance cycles.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent performs compensation operations during blank phases before the display phase begins. By detecting voltages and adjusting currents in advance during the blank phase, the system proactively compensates for degradation before it significantly impacts display quality, ensuring continuous reliable operation without interrupting the display function.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If compensation operations are performed frequently to maintain display quality, then light-emitting device degradation is mitigated, but power consumption increases

Engineering Contradiction:

Improvedisplay quality maintenanceVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent alternates compensation operations between two sub-circuits across different frame cycles, performing compensation only during blank phases rather than continuously. This periodic approach concentrates compensation efforts when the display is not actively showing content, maintaining display quality while avoiding continuous power expenditure that would occur with constant compensation operations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent performs compensation operations selectively during blank phases rather than during the entire display operation. By limiting compensation to specific time windows when display content is not being rendered, the system achieves sufficient degradation mitigation without the excessive power consumption that would result from continuous compensation throughout the entire frame cycle.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If dual sub-circuits are used for compensation to maintain display quality, then light-emitting device lifespan is extended, but circuit complexity increases

Engineering Contradiction:

Improvesub-pixel lifespanVSAvoidcontrol circuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the compensation function into two separate sub-circuits, each handling compensation for different rows of sub-pixels in alternating frame cycles. This segmentation allows each sub-circuit to be simpler in design while collectively providing comprehensive compensation coverage, extending overall system lifespan without requiring a single overly complex compensation circuit.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines two simpler sub-circuits to achieve the compensation function that would otherwise require a single complex circuit. By merging the capabilities of multiple simpler units that operate in coordination, the system extends device lifespan through comprehensive compensation while keeping individual circuit components manageable in complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12283240B2Light-emitting control circuit and control method thereof, and gate driving circuit and control method thereof

Publication Date: 2025.04.22 HEFEI BOE ZHUOYIN TECH CO LTD

AI summary

A light-emitting control circuit includes: a first detection control unit configured to transmit a first voltage signal to the first node under control of a detection control signal and a first clock signal; a first light-emitting output unit configured to transmit the first voltage signal to a first output signal terminal under control of a voltage of the first node; a second detection control unit configured to transmit the first voltage signal to a second node under control of the detection control signal and a second clock signal; and a second light-emitting output unit configured to transmit the first voltage signal to a second output signal terminal under control of a voltage of the second node.