Driver Circuit Segmentation for LCD Grayscale Uniformity
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Solution Overview
Problem
In liquid crystal panel drivers using static drive systems, unintended grayscale densities occur due to wiring capacity differences between segment electrodes and terminals, leading to inhomogeneous brightness across the display.
Innovation Solution
A driver circuit with first and second terminals connected to segment electrodes via wires of different lengths or widths, utilizing distinct pulse width signal groups with different correlations between grayscale levels and pulse widths to adjust segment drive signals, ensuring uniform grayscale densities across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pulse width signal group is used for all segment electrodes, then the device complexity is reduced, but grayscale density uniformity deteriorates due to wiring capacity differences
Solution Approach 1:
The pulse width signal group is segmented into multiple sub-groups (first pulse width signal group and second pulse width signal group), each tailored for specific segment electrodes with different wiring capacities. This segmentation allows independent optimization of grayscale levels for each electrode group, resolving the uniformity issue without excessive complexity.
Solution Approach 2:
Different pulse width signal characteristics are assigned to different spatial locations (segment electrodes) based on their local wiring capacity characteristics. Segment electrodes connected by longer/narrower wires receive one pulse width signal group, while those with shorter/wider wires receive another, achieving local optimization of grayscale display.
2Device complexity
If wire length and width are standardized across all segment electrodes, then wiring complexity is reduced, but display flexibility and adaptability deteriorate
Solution Approach 1:
The patent changes the electrical parameters (pulse width durations) of the drive signals to adapt to fixed wiring characteristics. By adjusting pulse width parameters in the signal groups, the system achieves adaptability in grayscale configuration without requiring flexible wiring designs.
3Manufacturing precision
If pulse width signals are adjusted for each segment electrode to compensate wiring capacity differences, then grayscale density uniformity is improved, but device complexity increases
Solution Approach 1:
The driver circuit segments segment electrodes into multiple groups based on wiring capacity characteristics. Each group is driven by a dedicated pulse width signal group with optimized characteristics, achieving grayscale uniformity without requiring individual customization for each electrode.
Solution Approach 2:
The driver circuit is designed with multi-functionality to output different pulse width signal groups selectively. The control circuit can choose which signal group to apply based on the target segment electrode, providing universal adaptability across different electrode configurations without excessive complexity.
Data Source
AI summary
A driver includes a first terminal, a second terminal, a control circuit, a first drive circuit, and a second drive circuit. The control circuit outputs a first pulse width signal group and a second pulse width signal group. The first drive circuit outputs a first segment drive signal to the first terminal based on a pulse width signal selected according to grayscale data. The second drive circuit outputs a second segment drive signal to the second terminal based on the pulse width signal selected according to the grayscale data. The first terminal is coupled to a first segment electrode and the second terminal is coupled to a second segment electrode.