Shield Electrode for Flicker Reduction in Low-Frequency Display Driving
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Solution Overview
Problem
Low-frequency driving in display devices results in luminance differences between refresh and non-refresh frame periods, causing flicker that is visually noticeable.
Innovation Solution
Incorporating a shield electrode between the data signal line and the conductor connected to the gate electrode of the drive transistor, which suppresses electrical field formation and reduces luminance differences between refresh and non-refresh frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency driving is implemented to reduce power consumption and extend battery life, then energy efficiency is improved, but luminance stability deteriorates causing visible flicker
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the data signal line and the conductor connected to the gate electrode of the drive transistor. This shield electrode acts as a mediator that blocks or reduces electrical field interference during the update pause period, preventing unwanted potential changes that would cause luminance variations and flicker in low-frequency driving mode
2Stability of the object's composition
If refreshing is performed at high frequency to maintain luminance stability, then flicker is reduced, but power consumption increases
Solution Approach 1:
The shield electrode enables the system to maintain luminance stability without requiring high-frequency refreshing by blocking electrical field interference during non-refresh periods. This allows the display to operate successfully in low-frequency driving mode while preventing the luminance fluctuations that would otherwise cause flicker
3Stability of the object's composition
If a shield electrode is added to suppress electrical field formation and reduce flicker, then luminance stability is improved, but device complexity increases
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the data signal line and the conductor connected to the gate electrode of the drive transistor. This shield electrode acts as a mediator that blocks or reduces electrical field interference during the update pause period, preventing unwanted potential changes that would cause luminance variations and flicker in low-frequency driving mode
Solution Approach 2:
The shield electrode is positioned specifically in the critical region where electrical field interference occurs between the data signal line and the gate conductor. By applying the shielding function only where needed rather than throughout the entire display structure, the solution achieves luminance stability improvement with minimal additional complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes flicker in display devices performing low-frequency driving by maintaining consistent potential levels during switching periods, thereby reducing luminance differences and enhancing visual stability.
Implementation Method 1
a shield electrode located between the first data signal line and the conductor and adjacent to each of the first data signal line and the conductor in a plan view
Data Source
AI summary
A display includes: a light-emitting element; a first data signal line to which a signal corresponding to video data is supplied in a vertical scanning period and a signal not corresponding to video data is supplied in an update pause period; a drive transistor configured to control a current value of the light-emitting element; and a conductor electrically connected to a gate electrode of the drive transistor; a shield electrode located between the first data signal line and the conductor and adjacent to each of the first data signal line and the conductor in a plan view.