Flat Panel Display Pixel Driving Method for Flicker Reduction
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Solution Overview
Problem
Conventional flat panel displays with pixel multiplexing structures experience flickering due to unequal charging capabilities between adjacent pixels, caused by differences in gate voltages resulting from the characteristics of thin film transistors (TFTs).
Innovation Solution
A pixel driving method that adjusts scan voltages between adjacent scan lines to ensure the absolute difference is at least a threshold voltage, allowing for equal charging capabilities between sub-pixels by using a specific timing sequence for scan and data voltage application, ensuring that both sub-pixels receive data voltages with balanced gate voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel multiplexing structure is used to reduce driving circuit cost, then cost is reduced, but unequal charging capability between adjacent pixels causes flickering
Solution Approach 1:
The patent applies local quality by providing different scan voltages to different scan lines. Specifically, the first scan line receives a first scan voltage while the second scan line receives a second scan voltage that is higher than the first scan voltage by at least a threshold voltage of the TFT. This local differentiation in voltage levels compensates for the unequal charging capabilities caused by the pixel multiplexing structure, ensuring uniform display quality across all pixels while maintaining the cost benefits of pixel multiplexing.
2Device complexity
If conventional scan voltage is applied to both scan lines, then circuit design is simple, but gate voltage difference causes unequal charging capability
Solution Approach 1:
The patent implements parameter changes by modifying the scan voltage levels applied to different scan lines. The first scan line is provided with a first scan voltage, while the second scan line is provided with a second scan voltage that is higher than the first scan voltage by at least a threshold voltage of the TFT. This parameter adjustment ensures that both pixels connected to the same data line receive equal gate voltages through their respective TFTs, achieving uniform charging capability across pixels while maintaining relatively simple circuit design.
Data Source
AI summary
A pixel driving method applied to a flat panel display is provided. In a first time period, an Nth scan line provides a first scan voltage to a pixel row to conduct the corresponding thin film transistors (TFT). Also, an N+1th scan line provides a second scan voltage through the conducted TFTs to the corresponding first switches to conduct the first switches, and then a number of first data voltages of the corresponding data lines are outputted to the corresponding first pixel electrodes. The absolute value of the difference between the first scan voltage and the second scan voltage is not smaller than a threshold voltage of each TFTs.