TFT Pixel Charging Uniformity via Precharging Periods
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Solution Overview
Problem
Display panels suffer from uneven brightness and low image quality due to insufficient pixel charging caused by signal delays in the TFT switches, resulting from the resistor and capacitor effects in the data lines.
Innovation Solution
A method is introduced to determine the actual and precharging periods for each Gate IC on a TFT substrate, allowing for controlled TFT switch activation during these periods to ensure uniform pixel voltage, using a processor and memory to execute instructions that adjust the charging duration based on the current time point and preset charging duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data signal is transmitted through data line from opposite side of data source end, then data signal reaches scan lines, but signal is deformed due to resistor and capacitor effects causing delay in turning-on pixel TFT switches
Solution Approach 1:
The patent introduces a precharging period before the actual charging period, where pixel TFT switches are turned on in advance to charge pixels. This preliminary action compensates for the signal transmission delay caused by resistor and capacitor effects in data lines, ensuring that pixels receive sufficient charge even when signals are transmitted from the opposite side of the data source end.
2Device complexity
If preset charging time for each pixel is the same, then charging control is simplified, but delay in turning-on pixel TFT switches results in insufficiently charging pixels
Solution Approach 1:
The patent segments the charging process into two distinct periods: a precharging period and an actual charging period. This segmentation allows different portions of the pixel array to receive appropriate charging durations based on their position and signal transmission characteristics, improving charging uniformity while maintaining relatively simple control through standardized period definitions.
3Ease of operation
If scan line controlled by Gate IC has the same turning-on duration, then control is uniform, but delay of turning-on pixel TFT switches leads to uneven brightness
Solution Approach 1:
The patent applies local quality by differentiating the charging periods for different Gate ICs based on their positions in the pixel array. Gate ICs controlling scan lines farther from the data source end receive longer precharging periods to compensate for greater signal transmission delays, while those closer to the source receive shorter or no precharging. This localized adjustment ensures uniform brightness across the display while maintaining ease of operation through systematic control.
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
This approach ensures that pixel voltages reach the set value uniformly, enhancing the brightness uniformity and picture quality of the display panel.
Implementation Method 1
controlling TFT switches corresponding to the scan line for each of the target Gate ICs to be turned on during the precharging period and the actual charging period, to charge pixels corresponding to the scan lines
Data Source
AI summary
The present invention provides a pixel charging method, including: a preset charging duration and a current time point are acquired when a first gate integrated circuit is turned on; a precharging period and an actual charging period of a scan line of each target integrated circuit of the thin film transistor substrate are determined based on the preset charging duration and the current time point; thin film transistor switches corresponding to the scan line of each of the target gate integrated circuits are controlled to be turned on during the precharging period and the actual charging period of the scan line.