LED Display Row Line Resetting for Parasitic Capacitance Interference
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Solution Overview
Problem
Conventional LED display devices experience image quality degradation due to interference between high and low grayscale images caused by parasitic capacitances between row and column lines, leading to image sticking during dynamic display.
Innovation Solution
A method and device that utilize a reset module to pre-charge parasitic capacitors between row and column lines using a reset voltage, dividing display data into packets by weight and arranging them in ascending order, with intra-row resetting between packets to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high grayscale images are displayed continuously, then the luminance of LED is increased, but parasitic capacitances cause interference to low grayscale images, resulting in image sticking
Solution Approach 1:
The patent applies preliminary action by pre-charging the parasitic capacitances before displaying low grayscale images. A reset voltage is applied to charge the parasitic capacitances between row and column lines in advance, preventing them from causing image sticking when transitioning to low grayscale images. This preparatory charging action eliminates the harmful discharge effect that would otherwise occur during normal operation.
2Object-affected harmful factors
If reset voltage is applied to pre-charge parasitic capacitors, then image sticking is reduced, but additional control circuitry and timing complexity is introduced
Solution Approach 1:
The patent merges the reset function with the existing row selection and column driving circuits. The reset voltage is applied through the same row lines and column lines that are used for normal LED driving, combining the parasitic capacitance charging function with the existing display control infrastructure. This integration approach reduces the need for separate dedicated reset circuitry while still achieving the desired image quality improvement.
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 improves dynamic display quality by minimizing interference between high and low grayscale images, enhancing the overall image quality by reducing image sticking and parasitic capacitance effects.
Implementation Method 1
Because parasitic capacitances exist between row and column lines, displaying high grayscale images will cause interference to the display of low grayscale images
Data Source
AI summary
An LED display device and a method for driving the same are disclosed. The LED display device includes a plurality of pixel units being coupled to the row and column lines. In each of the row periods, the method comprises: displaying a display data in a manner of packet-by-packet; and pre-charging the parasitic capacitors between the row and column line by use of a reset voltage to implement a reset between the successive groups. According to the disclosure, a reset is performed between the packets in each row period to reduce the interference to the low grayscale image by the high grayscale image, such that the dynamic display quality of the image is improved.