Display Device Scan Pulse Amplitude Modulation
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Solution Overview
Problem
Active matrix LCD devices experience luminance differences between adjacent pixels due to deteriorated charging properties, leading to poor picture quality, especially when pixels receive data signals of different polarities during alternating charging periods.
Innovation Solution
The display device modulates pulse width and amplitude of scan pulses supplied to gate lines, dividing pixel cells into groups and alternating the polarity of data signals between odd and even-numbered groups, while adjusting scan pulse amplitudes and widths to ensure consistent charging across neighboring pixel cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data lines are driven by 2-dot driving mode with alternating polarities, then charging properties deteriorate causing luminance differences, but using same polarity continuously would cause charge accumulation and display artifacts
Solution Approach 1:
The patent applies local quality by differentiating the treatment of adjacent pixel cells. Specifically, pixel cells are divided into first and second regions, where scan pulses of different amplitudes are applied to gate lines controlling pixels in different regions. This local differentiation compensates for the harmful luminance differences caused by alternating polarity data signals, ensuring uniform display quality across the screen while maintaining the benefits of 2-dot driving mode.
2Manufacturing precision
If scan pulses have fixed amplitude, then device complexity is low, but luminance differences between adjacent pixels cannot be compensated
Solution Approach 1:
The patent implements dynamics by making scan pulse amplitude variable rather than fixed. The amplitude of scan pulses is dynamically adjusted based on the region they control - first amplitude for gate lines in the first region and second amplitude for gate lines in the second region. This dynamic adjustment enables precise compensation of luminance differences while maintaining manageable device complexity through systematic amplitude differentiation.
Data Source
AI summary
A display device and driving method are provided. A display device includes a display area that includes a plurality of pixel cells in respective pixel regions defined by a plurality of gate and data lines crossing each other. A data driver is operable to supply data signals to the pixel cells. The pixel cells are connected with the first data line and are divided into a plurality of pixel-cell groups. The data driver is operable to supply the data signal of first polarity to the pixel cells included in the odd-numbered pixel-cell groups, and to supply the data signal of second polarity to the pixel cells included in the even-numbered pixel-cell groups. The first polarity is opposite to the second polarity. A shift register that is operable to drive the gate lines to supply the scan pulses of different amplitudes to neighboring pixel cells included in the different pixel-cell groups.