Display Matrix Driving Using Wavelet-Based Voltage Selection
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Solution Overview
Problem
Existing display technologies face challenges in reducing hardware complexity while achieving high-quality images with good brightness uniformity and fast switching times between gray shades, especially when displaying a large number of gray shades.
Innovation Solution
The system employs a voltage level generator, row and column voltage selectors, and a controller to generate control signals using wavelet matrices, where wavelets are chosen based on gray shade data bits, and the number of rows is optimized to facilitate address generation, reducing hardware complexity by using analog multiplexers and shift registers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional display driving techniques are used to display a large number of gray shades, then the number of gray shades increases, but the hardware complexity of display drivers increases significantly
Solution Approach 1:
The display matrix is divided into multiple sub-matrices, with each sub-matrix driven by a dedicated driver. This segmentation allows the system to handle large numbers of gray shades by distributing the driving complexity across multiple independent drivers, rather than requiring a single complex driver to handle all gray shades simultaneously.
Solution Approach 2:
The patent introduces a time dimension by sequentially driving different sub-matrices at different time intervals. This temporal multiplexing approach allows the system to display multiple gray shades over time using the same physical hardware, effectively increasing the number of displayable gray shades without proportionally increasing hardware complexity.
2Manufacturing precision
If more gray shades are displayed to increase color depth, then image quality improves, but switching times between gray shades increase
Solution Approach 1:
The system pre-calculates and stores driving waveforms for different gray shades in lookup tables within each driver. When a gray shade transition is requested, the driver retrieves the pre-computed waveform data, avoiding real-time calculation delays. This preliminary preparation of control signals significantly reduces switching times between gray shades while maintaining high image quality.
3Device complexity
If hardware complexity is reduced using simpler drivers, then device complexity decreases, but the number of displayable gray shades is limited
Solution Approach 1:
Multiple simple drivers are merged to collectively drive a large display matrix capable of showing many gray shades. Each driver handles a subset of the display matrix with simplified hardware, but through coordinated operation and time-multiplexed control, the combined system achieves the capability to display a large number of gray shades across the entire matrix.
Data Source
AI summary
A system and method to drive display matrix, comprising: a voltage level generator to provide predetermined voltages, a row voltage selector to select a group of voltages from the voltage level generator depending on select vector to drive row drivers, a column voltage selector to select a group of voltages from the voltage level generator depending on data vector to drive column drivers, and a controller to generate control signals to scan the display as dictated by addressing technique.