Gate Driving Voltage Control for Display Panel Lifespan

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Solution Overview

Problem

The degradation of circuit components in the gate driving circuit of display devices due to direct current (DC) gate bias stress leads to reduced lifespan and image quality.

Innovation Solution

A display device and driving method that gradually increase the gate driving voltage from its initial value, sensed upon power-on, to mitigate component degradation, using a power control circuit and sensing circuit to monitor and adjust the voltage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a high gate driving voltage is continuously applied to ensure proper operation of the gate driving circuit, then the circuit can function reliably, but the transistors experience degradation due to DC gate bias stress, reducing lifespan and image quality

Engineering Contradiction:

Improvegate driving circuit operationVSAvoidtransistor lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The gate driving voltage is changed from a static constant value to a dynamic time-varying signal. The voltage starts at a higher initial level to ensure reliable circuit operation, then gradually decreases to a lower maintenance level, creating a dynamic operating regime that adapts to the circuit's startup and steady-state requirements while reducing long-term stress on transistors

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The gate driving voltage is applied in a periodic manner with distinct phases: an initial high-voltage phase for reliable startup and operation, followed by a gradual transition to a lower voltage phase for sustained operation. This periodic voltage application pattern allows the circuit to benefit from high voltage when needed while minimizing exposure to stress conditions

Inventive Principle:

Principle #19Periodic action

2Reliability

If the gate driving voltage is gradually increased from baseline to ensure proper circuit power-on, then the circuit can initialize correctly, but continuous high-level voltage application causes transistor degradation

Engineering Contradiction:

Improvecircuit power-onVSAvoidDC gate bias stress

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A preliminary high gate driving voltage is applied only during the initial power-on phase to ensure proper circuit initialization and operation. After the circuit is successfully powered on, the voltage is gradually reduced to a lower level, eliminating the harmful DC gate bias stress while maintaining the beneficial preliminary action that ensures reliable startup

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The voltage transition is designed to gradually reduce stress after initial power-on, providing a cushioning effect that protects transistors from sustained high-voltage stress. The gradual voltage decrease acts as a protective measure that cushions against the harmful effects of DC gate bias stress while maintaining operational reliability

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS12340757B2Display device and driving method thereof

Publication Date: 2025.06.24 LG DISPLAY CO LTD

AI summary

Embodiments relate to a display device and driving method thereof. A display device includes a display panel including a pixel arranged thereon, a gate driving circuit configured to supply a scan signal to the pixel, a power control unit configured to output a gate driving voltage to the gate driving circuit, a sensing unit configured to sense an input electric signal and output sensing data, and a timing controller configured to control operations of the gate driving circuit.