Variable Frequency Gate Scanning for TFT-LCD Image Quality
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Solution Overview
Problem
Conventional gate isochronous scanning technologies in TFT-LCD displays fail to optimize image quality, particularly in the middle region of large-size LCDs, due to uniform charging times across all scanning lines, leading to insufficient image quality.
Innovation Solution
A driving method for gate scanning lines using a variable frequency CKV waveform, where the opening time is gradually increased from the first line to the middle line and then decreased from the middle line to the N-th line, with specific relationships between opening times to optimize charging times and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gate isochronous scanning technology is used with uniform opening times for all scanning lines, then the device complexity is reduced and ease of operation is improved, but the image quality in the middle region deteriorates due to insufficient charging time
Solution Approach 1:
The patent applies local quality by differentiating the opening times of gate scanning lines based on their position. The middle region lines (from N/4 to 3N/4) are assigned a different opening time (T2) compared to the edge region lines (T1), where T2 > T1. This localized differentiation optimizes charging time for the middle region without unnecessarily complicating the entire system.
2Manufacturing precision
If the opening time of middle region scanning lines is increased to improve charging time and image quality, then the image quality in the middle region is improved, but the overall scanning time and productivity are reduced
Solution Approach 1:
The patent optimizes charging time locally in the middle region by extending opening time only for lines N/4 to 3N/4, while maintaining shorter opening times for edge lines. This selective approach improves middle region image quality without proportionally increasing the total scanning time for all lines.
Solution Approach 2:
The gate scanning operates in periodic cycles, with each scanning period containing multiple line scanning operations. By optimizing the opening time within each periodic cycle according to position, the system achieves improved charging without requiring extended total scanning periods.
Data Source
AI summary
The present disclosure discloses a driving method and a driving system for gate scanning line and a TFT-LCD display panel, the method includes: driving the gate scanning lines line by line through the CKV waveform of variable frequency of gate driver; from the first gate scanning line to the middle line of the gate scanning line, the opening time is gradually increased; from the middle line of the gate scanning line to the N-th line of the scanning line, the opening time is gradually decreased. the scanning method using unequal time of each line of gate scanning line of each line of the present disclosure, the charging time of the middle line is the longest, the charging time is gradually decreased from the middle line to both sides, increasing the charging time of the TFT-LCD of the middle region in the display panel and optimizing the overall quality performance.