Electro-optical Driving Circuit Sub-field Segmentation for Gray Scale Accuracy

The patent divides one field into multiple groups (e.g., 4 groups), and each group is divided into two sub-fields, creating a hierarchical segmentation structure. This allows independent control of sub-field time periods within each group, enabling continuous gray scale display even when response speed varies due to temperature changes. The segmentation principle resolves the contradiction by allowing short sub-field periods (for high luminance levels) in some groups while maintaining longer periods (for accurate gray scale) in other groups.

The patent dynamically adjusts the time periods of sub-fields within each group based on the required gray scale levels. By making the sub-field time periods variable rather than fixed, the system can adapt to temperature-induced response speed variations. This dynamic adjustment allows the display to maintain appropriate gray scale accuracy while still providing numerous addressable luminance levels through region scanning driving.

The patent applies segmentation by dividing the scanning process into multiple groups, where each group handles a subset of scanning lines. Instead of selecting all scanning lines within one short sub-field period, the system selects scanning lines across multiple sub-fields in a segmented manner. This reduces the time pressure on each individual sub-field while maintaining overall efficiency and reducing device complexity.

The patent implements preliminary action through region scanning driving, where scanning lines are selected in a predetermined pattern across multiple sub-fields. By pre-planning the scanning sequence and grouping scanning lines into regions, the system avoids the need for complex real-time selection logic within each sub-field, thereby reducing device complexity while achieving efficient time utilization.

The patent resolves this contradiction by segmenting the field into multiple groups, where each group can independently control continuity of sub-fields. Some groups maintain continuous sub-fields for accurate gray scale display, while other groups can use shorter sub-field periods to increase addressable luminance levels. This segmentation allows simultaneous achievement of both gray scale accuracy and high luminance level resolution.

The patent applies local quality by allowing different sub-field configurations in different regions (groups) of the display. Each group can be optimized locally - some groups use continuous sub-fields for gray scale accuracy, while others use shorter periods for higher luminance levels. This local optimization resolves the contradiction by allowing both requirements to coexist in different parts of the same display system.