Display Panel Second Common Electrode Flickering Reduction
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Solution Overview
Problem
Liquid crystal display panels experience significant flickering due to low deflection frequencies of liquid crystal molecules, which are easily observable by human eyes, leading to potential damage and poor display quality.
Innovation Solution
Incorporating a second common electrode connected to an alternating voltage at a high frequency, which forms a capacitor with the pixel electrode, increasing the voltage frequency and reducing voltage variation, thereby improving flickering issues without altering the deflection frequency of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If liquid crystal molecules are driven by pixel electrode to deflect at low frequency, then the structure is simple, but screen flickering is serious and easily observed by human eyes
Solution Approach 1:
The invention divides the common electrode function into two separate electrodes: first common electrode and second common electrode. The second common electrode is specifically responsible for applying high-frequency alternating voltage to suppress flickering, while the first common electrode maintains the basic liquid crystal alignment. This segmentation allows each electrode to perform its specialized function effectively without increasing overall system complexity significantly.
Solution Approach 2:
The second common electrode acts as an intermediary element that introduces high-frequency voltage signals to the liquid crystal molecules through the pixel electrode. This intermediary component enables the suppression of screen flickering by adding a high-frequency component that prevents the liquid crystal molecules from maintaining static deflection states, thereby reducing observable flickering effects.
2Reliability
If alternating voltage is applied to liquid crystal molecules to prevent damage, then reliability is improved, but flickering phenomenon occurs due to asymmetric deflection
Solution Approach 1:
The invention applies periodic alternating voltage through the second common electrode at a frequency of 120Hz or higher. This periodic high-frequency voltage causes the liquid crystal molecules to continuously change their deflection state, preventing them from remaining in asymmetric positions for extended periods. The periodic action ensures both the protection of liquid crystal molecules from damage and the suppression of visible flickering by maintaining dynamic equilibrium.
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 reduces the observability of screen flickering by increasing the voltage frequency applied to the pixel electrode, enhancing display panel performance and preventing damage from prolonged liquid crystal molecule deflection.
Implementation Method 1
the second common electrode and the pixel electrode form a capacitor, so after an alternating voltage at a first frequency is applied to the second common electrode, the alternating voltage at the first frequency is applied to the pixel electrode through the charging or discharging of the capacitor
Data Source
AI summary
The present disclosure provides a display panel, a method and a device for measuring screen flickering, and a display device. The display panel includes a substrate, data lines and gate lines arranged on the substrate and crossing each other, and subpixel units defined by the data lines and the gate lines. Each subpixel unit includes a TFT, a pixel electrode, a first common electrode and a second common electrode. The second common electrode is connected to an input end capable of providing an alternating voltage at a first frequency. An orthogonal projection of the second common electrode onto the substrate at least partially overlaps an orthogonal projection of the pixel electrode onto the substrate.