Array Substrate Driving Method for Display Uniformity
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Solution Overview
Problem
Display panels often experience issues with bright and dark stripes due to the parasitic capacitance effect, which leads to uneven charging and brightness across sub-pixels, resulting in unsatisfactory display uniformity.
Innovation Solution
A driving method for an array substrate that alternates the polarity of data drive signals between first and second sub-pixels in different time periods, ensuring that each column of sub-pixels is evenly charged and lit, with first sub-pixels connected to one row scan drive signal line and second sub-pixels connected to another, allowing for uniform display without bright or dark stripes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion drive is used to drive liquid crystal molecules, then the display can achieve alternating current drive, but the parasitic capacitance effect causes load effect that delays voltage response and creates bright and dark stripes
Solution Approach 1:
The patent segments the sub-pixels into different groups (first sub-pixels and second sub-pixels) that are driven by different row scan drive signal lines. This segmentation allows different charging strategies to be applied to different groups, preventing the uniform parasitic capacitance effect from causing systematic bright and dark stripes across the entire display.
Solution Approach 2:
The patent implements periodic polarity inversion for different sub-pixel groups at different time periods. First sub-pixels receive positive polarity signals during first time periods while second sub-pixels receive negative polarity signals during second time periods, and this pattern alternates periodically. This periodic action with phase shifting between groups compensates for the parasitic capacitance delay effects.
2Productivity
If scan drive time is reduced by half to maintain driving speed, then productivity is improved, but charging time becomes insufficient leading to undercharged sub-pixels and brightness degradation
Solution Approach 1:
The patent uses periodic polarity inversion with extended duration for each polarity state. Instead of rapid alternating scans, the system holds each polarity state for a sufficient duration to ensure complete charging of sub-pixels before switching to the opposite polarity. This periodic action with adequate pulse width maintains both speed and charging completeness.
Solution Approach 2:
The patent applies preliminary charging action by ensuring that each sub-pixel group receives sufficient charging time at its designated polarity before the next switching cycle begins. The charging process is allowed to complete fully in advance of the required display refresh, preventing undercharging while maintaining overall driving speed through optimized timing sequences.
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 ensures sufficient charging time for each sub-pixel, preventing bright and dark stripes, and maintains display uniformity, making the solution effective in reducing brightness deviations and improving the overall display quality.
Implementation Method 1
Because of the load effect caused by the parasitic capacitance effect generated by the data drive line and other electrodes
Data Source
AI summary
Disclosed are a driving method of an array substrate and an array substrate. The driving method of the array substrate controls a data drive signal line to output a first polarity data drive signal in a first time period and output a second polarity data drive signal in a second time period alternately. In the first time period, the first polarity data drive signal is output to drive the first sub-pixels of each pixel group to make the first sub-pixel of each pixel group to be a first polarity. In the second time period, the second polarity data drive signal is output to drive the second sub-pixel of each pixel group to make the second sub-pixel of each pixel group to be a second polarity. Polarities of sub-pixels of each column are the same.