Display Panel Driving Timing for Black-State Flicker Suppression
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Solution Overview
Problem
Transistors in pixel circuits of display panels are prone to leakage due to forward biasing of threshold voltage caused by static friction, coupling static, and electrostatic fields, leading to screen flickering during power on and off, which affects user experience.
Innovation Solution
A driving method for display panels involves positioning a metal pattern between the substrate and pixel circuit to overlap transistor channels, controlling voltage application to the metal pattern and data line in specific stages to offset threshold voltage bias, ensuring symmetrical power-on and power-off timings and voltages to maintain a uniform black state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are used in pixel circuits to drive light-emitting elements, then display functionality is achieved, but transistor leakage causes screen flickering during power on and off
Solution Approach 1:
The metal pattern is powered on before the data line during power-on stage, and powered off after the data line during power-off stage. This preliminary action establishes a negative bias state in the transistor channel before data writing occurs, preventing forward bias that would cause leakage and flickering during power transitions.
Solution Approach 2:
A metal pattern is introduced as an intermediary element between the substrate and the pixel circuit. This metal pattern serves as a mediator to apply electrostatic influence to the transistor channels, creating a negative bias state that counteracts the forward bias caused by friction static, coupling static, and electrostatic fields, thereby reducing leakage current.
2Object-generated harmful factors
If a metal pattern is added to overlap transistor channels to offset threshold voltage bias, then current leakage is reduced, but device structure becomes more complex
Solution Approach 1:
The metal pattern serves multiple functions: it acts as an electrostatic influence element to modulate transistor threshold voltage, and can simultaneously serve as part of the display panel's existing metal layer structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity while achieving leakage reduction.
Solution Approach 2:
The invention changes the voltage parameter applied to the metal pattern dynamically - applying a first voltage during power-on stage, a second voltage during display stage, and a third voltage during power-off stage. By changing voltage parameters rather than structural configuration, the solution achieves leakage control without permanently increasing structural 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 method effectively reduces screen flickering by mitigating transistor leakage, ensuring consistent black states during power transitions, thereby enhancing user experience.
Implementation Method 1
the metal pattern overlaps an orthographic projection of a channel of at least a portion of transistors in the pixel circuit on the substrate
Data Source
AI summary
A driving process of the display panel includes a first stage, a display stage, and a second stage. The driving method of the display panel includes the following steps. A first voltage is started to be provided to the metal pattern at the first time in the first stage, where the first voltage is greater than 0. A first black-state voltage is started to be provided to the data line at the second time in the first stage. A second voltage is stopped to be provided to the metal pattern at the third time in the second stage, where the second voltage is greater than 0. A second black-state voltage is stopped to be provided to the data line at the fourth time in the second stage. The first time is before the second time, and/or the third time is after the fourth time.