Cross Voltage Compensation for Display Panels
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Solution Overview
Problem
The alternating current (AC) driving method in display panels often results in insufficient charging of pixels due to large voltage differences and polarity changes between frames, leading to a dark display.
Innovation Solution
A cross voltage compensation method where a preset voltage signal with the same polarity as the next frame is transmitted to in-plane data lines during the V-blank time, keeping all scanning lines closed, to reduce cross-voltage issues and ensure sufficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC driving method is adopted to prevent liquid crystal polarization, then polarization is prevented, but pixel charging becomes insufficient leading to dark display
Solution Approach 1:
The patent applies preliminary action by pre-charging the data lines with a preset voltage signal during the V-blank period before the actual data transmission begins. This advance preparation ensures that when the first row of the next frame is scanned, the data lines are already at the correct voltage level, enabling sufficient pixel charging from the start and preventing the dark display issue caused by AC driving method.
2Illumination intensity
If voltage compensation is applied to ensure normal display, then display quality is maintained, but cross-voltage issues occur between frames
Solution Approach 1:
The patent uses preliminary action by preparing the voltage signal in advance during V-blank period. The preset voltage signal is applied to data lines before the next frame's first row scanning starts, ensuring smooth voltage transition and eliminating cross-voltage issues between frames while maintaining proper display brightness.
Solution Approach 2:
The patent introduces an intermediary mechanism by using a preset voltage signal as a bridge between the end of one frame and the start of the next frame. This intermediary voltage preparation during V-blank period mediates the transition, preventing direct voltage conflicts and cross-voltage problems that would otherwise occur between alternating frames.
3Productivity
If scanning lines are kept open during voltage signal transmission, then data transmission is efficient, but cross-voltage interference occurs
Solution Approach 1:
The patent applies preliminary action by keeping scanning lines in a closed state during the V-blank period when the preset voltage signal is being transmitted to data lines. This timing arrangement allows efficient voltage preparation without causing cross-voltage interference, as the scanning lines are closed during this preparatory phase and only opened when actual data transmission is ready to begin.
Data Source
AI summary
The present application discloses a cross voltage compensation method for a display panel, a display panel and a display device. The cross voltage compensation method includes steps of transmitting a preset voltage signal to in-plane data lines after scan of scanning lines of a last row of a current frame is completed and before scanning lines of a first row of a next frame are started, keeping all the scanning lines at a close state while transmitting the preset voltage signal to in-plane data lines, and keeping all the scanning lines at a close state after scan of scanning lines of a last row of a current frame is completed and before scanning lines of a first row of a next frame are started, that is, V-blank time.