Display Pixel Source Voltage Coupling to Eliminate Flicker
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Solution Overview
Problem
Display devices experience flicker and ghost images when the driving frequency changes, leading to suboptimal performance and increased power consumption.
Innovation Solution
A display device design that includes a display panel with pixels comprising a light-emitting element, driving transistors, and capacitors to control voltage at the source electrode, allowing for high-speed driving while minimizing flicker and ghost images by coupling the source electrode voltage using a gate-off voltage of the emission signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the driving frequency of the display device is changed, then the display device can adapt to different operating conditions, but flicker and ghost images occur
Solution Approach 1:
The capacitor is pre-charged to a specific voltage level before the emission period begins. This preliminary charging ensures that when the emission signal transitions to gate-off voltage, the capacitor maintains the source electrode voltage at the appropriate level, preventing flicker and ghost images from the outset rather than correcting them afterward
Solution Approach 2:
The capacitor acts as an intermediary element between the emission control line and the source electrode of the driving transistor. It mediates the voltage transition by storing and releasing charge to maintain stable source electrode voltage during emission signal transitions, thereby eliminating flicker and ghost images while preserving driving frequency adaptability
2Productivity
If the driving frequency is increased for high-speed driving, then productivity is improved, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts the driving frequency of different signal paths independently. The emission control line can operate at a lower frequency while data and scan signals operate at higher frequencies, allowing the system to optimize performance for each signal type and reduce overall power consumption while maintaining high productivity
Solution Approach 2:
The driving signals are segmented into different frequency domains. The emission control signal operates at a lower frequency to reduce power consumption, while data lines and scan lines operate at higher frequencies to maintain high-speed driving performance. This segmentation allows independent optimization of power efficiency and productivity
Data Source
AI summary
A display device includes a display panel for driving a plurality of pixels. Each of the plurality of pixels includes: a light-emitting element; a driving transistor for controlling a driving current flowing through the light-emitting element; a first transistor for selectively applying a data voltage to a first node, a second transistor for receiving an emission signal from an emission control line to selectively apply a driving voltage to the first node; and a first capacitor connected between the first node and the emission control line. The first node is a source electrode of the driving transistor.