Array Substrate Capacitor Layout for Variable Refresh Flicker
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Solution Overview
Problem
The existing 4-Mask process for display panels supporting variable refresh rates leads to screen flicker due to parasitic capacitance changes, which is typically addressed by adding a costly photomask manufacturing procedure, increasing production costs and reducing efficiency.
Innovation Solution
An array substrate with a drive transistor having a gate and drain extension portion that forms a second storage capacitor, compensating for variable gate-source capacitance, thereby mitigating screen flicker without additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photomask manufacturing procedure is added to solve screen flicker caused by pixel feed-in voltage difference, then screen flicker is reduced, but production cost is increased and production efficiency is reduced
Solution Approach 1:
The patent extracts the harmful parasitic capacitance effect by separating the storage capacitor function from the traditional pixel structure. A dedicated storage capacitor is introduced with its plate electrically connected to the pixel electrode and another plate electrically connected to the data line, thereby isolating the voltage compensation function from the pixel feed-in path and eliminating the screen flicker issue without requiring photomask process changes
Solution Approach 2:
The patent introduces an intermediary storage capacitor between the pixel electrode and data line to mediate the voltage relationship. This storage capacitor acts as a buffer that compensates for voltage changes caused by parasitic capacitance variations in the drive transistor, thereby preventing screen flicker while maintaining compatibility with the existing 4-Mask manufacturing process
2Reliability
If a photomask manufacturing procedure is added to solve screen flicker caused by pixel feed-in voltage difference, then screen flicker is reduced, but production cost is increased
Solution Approach 1:
The data line serves multiple functions: it acts as both a signal transmission line for pixel data and as one of the plates for the storage capacitor. This multi-functionality eliminates the need for additional photomask layers while achieving screen flicker reduction, thereby maintaining low production costs
Solution Approach 2:
The patent merges the storage capacitor structure with the existing pixel electrode and data line configuration. By forming the storage capacitor using the same manufacturing layers and processes as the pixel structure, the solution achieves screen flicker reduction without requiring separate photomask manufacturing procedures, thus avoiding increased production costs
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 screen flicker and improves production efficiency by modifying the gate and drain shapes, eliminating the need for extra manufacturing procedures and reducing production costs.
Implementation Method 1
The first extension portion and the second extension portion overlap in the direction perpendicular to the array substrate to form a second storage capacitor
Data Source
AI summary
An array substrate, a preparation method thereof and a display apparatus are provided. The array substrate includes a plurality of pixel units distributed in a matrix and a plurality of scan lines and a plurality of data lines. Each pixel unit includes a display region and a device region. The display region includes a pixel electrode and a common electrode. The pixel electrode at least partially overlaps with the common electrode to form a first storage capacitor. The device region includes a drive transistor. The gate extends in a direction towards the display region to form a first extension portion; the drain extends in the direction towards the display region to form a second extension portion. The second extension portion is electrically connected to the pixel electrode. The first extension portion and the second extension portion overlap to form a second storage capacitor.