Display Driving Circuit Mode Switching Polarity Alignment
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Solution Overview
Problem
Conventional liquid crystal display devices using CC driving systems face issues when switching between different display modes with varying video signal resolution, resulting in alternate bright and dark transverse stripes due to polarity reversals of CS signals not aligning with source signals during resolution conversion.
Innovation Solution
A display driving circuit and method that alternately switch between display modes by adjusting signal potentials on pixel electrodes using retention capacitor wire signals, ensuring proper polarity reversal alignment for n-line and m-line inversion driving, where n and m are integers, to maintain consistent gray scale and polarity across adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid crystal display device switches from normal display driving (1-line inversion) to resolution conversion driving, then the resolution of the video signal is converted into higher resolution, but alternate bright and dark transverse stripes appear in the display picture due to polarity mismatch
Solution Approach 1:
The patent applies dynamics by making the inversion driving period variable rather than fixed. The control circuit dynamically adjusts the inversion driving period to match the pixel electrode polarity reversal period based on the current display mode (normal or resolution conversion), enabling seamless mode switching without displaying transverse stripes while maintaining high display quality
Solution Approach 2:
The patent changes the parameter of inversion driving period from a fixed value to a variable parameter that adapts to different display modes. By adjusting this parameter to synchronize with the pixel electrode polarity reversal period in each mode, the system eliminates display artifacts during mode transitions while preserving image quality
2Manufacturing precision
If the polarity of CS signal is reversed every single line in normal display driving, then the display quality is maintained, but the polarity reversal does not align with source signals during resolution conversion driving
Solution Approach 1:
The control circuit implements feedback by detecting the current display mode and automatically adjusting the inversion driving period to synchronize with the pixel electrode polarity reversal period. This feedback mechanism ensures that the CS signal polarity reversal remains aligned with source signals during resolution conversion driving while maintaining display quality in normal mode
Solution Approach 2:
The system dynamically adjusts the inversion driving period based on the display mode, making the signal synchronization adaptive rather than static. This dynamic adjustment ensures reliable signal alignment during mode transitions while preserving the benefits of polarity reversal in normal display driving
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 eliminates the appearance of transverse stripes by ensuring proper electric potential shifts during mode switching, allowing for seamless transition between different resolution conversion factors without degrading display quality.
Implementation Method 1
by supplying retention capacitor wire signals to retention capacitor wires forming capacitors with pixel electrodes included in pixels, signal potentials written to the pixel electrodes from data signal lines are changed in a direction corresponding to polarities of the signal potentials
Data Source
AI summary
A display device employing CC driving switches from (i) a first mode in which to carry out a display by converting resolution of a video signal by a factor of 2 in a column-wise direction to (ii) a second mode in which to carry out a display at the resolution of the video signal. During the first mode, signal potentials having the same polarity and the same gray scale are supplied to pixel electrodes included in respective two pixels that correspond to two adjacent scanning signal lines and that are adjacent to each other in the column-wise direction, and a direction of change in the signal potentials written to the pixel electrodes varies every two adjacent rows (2-line inversion driving). During the second mode, the direction of change in the signal potentials written to the pixel electrodes lines varies every single row (1-line inversion driving).