Pixel Driving Circuit Pre-Charging for LCD Image Quality
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Solution Overview
Problem
Current Liquid Crystal Display (LCD) technologies face image quality deterioration due to insufficient charging of pixel electrodes at high refreshing frequencies, where the charging time is short for each row of scanning lines.
Innovation Solution
A pixel driving circuit and method that includes a pre-charging unit connected to each row of scanning lines, activating the (i+2)th row simultaneously with the ith row, utilizing pre-charging thin film transistors and thin film transistors to reduce the voltage difference between charging and pre-charging voltages, thereby ensuring adequate charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refreshing frequency of the LCD is increased, then the display performance is improved, but the charging time for each row of scanning lines becomes insufficient
Solution Approach 1:
The patent applies preliminary action by pre-charging the pixel electrodes of the (i+2)th row while the ith row is being charged. This is achieved by activating the (i+2)th row of scanning line at the same time when the ith row of scanning line is activated, allowing the pixel electrodes to receive charge in advance before they need to be fully operational, thus solving the insufficient charging time problem at high refreshing frequencies
2Manufacturing precision
If the charging time is extended to ensure sufficient charging, then the image quality is improved, but the refreshing frequency must be reduced
Solution Approach 1:
By pre-charging pixel electrodes in advance during the activation of earlier scanning lines, the patent ensures that when each row needs to be fully charged, the charging process has already begun, reducing the additional charging time needed and maintaining both image quality and high refreshing frequency
Solution Approach 2:
The patent introduces a temporal dimension to the charging process by overlapping the charging cycles of different scanning lines. Instead of charging each row sequentially, multiple rows are charged in parallel with different timing offsets, effectively utilizing time as an additional dimension to resolve the contradiction between charging duration and refreshing frequency
Data Source
AI summary
A pixel driving circuit and method, an array substrate and a LCD apparatus, solve the problem of a deterioration of an image quality due to an insufficient charging to a pixel electrode when a refreshing frequency of the LCD is relatively high. The pixel driving circuit comprises n rows of scanning lines, where n is an integer and n≧3, and the pixel driving circuit further comprises a pre-charging unit connected to each row of scanning line, for activating the (i+2)th row of scanning line at the same time when the ith row of scanning line is activated, where i is an integer and 1≦i≦n−2. The array substrate comprises a number of pixel units distributed in a matrix, and further comprises the pixel driving circuit as described above. The LCD apparatus comprises the array substrate as described above. The pixel driving method is used for driving n rows of scanning lines, where n is an integer and n≧3, and activating the (i+2)th row of scanning line at the same time when the ith row of scanning line is activated, where i is an integer and 1≦i≦n−2.