Electro-optic Device Sub-field Period Segmentation
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Solution Overview
Problem
Existing electro-optic devices face challenges in increasing the number of displayable gray scales while ensuring sufficient selection time for scanning lines, as increasing the number of sub-fields requires higher driving frequency or reduced selection time.
Innovation Solution
An electro-optic device is designed with a configuration that divides one field into multiple sub-fields, using interlaced scanning and varying period lengths for different groups of sub-fields to control pixel ON/OFF states, ensuring longer selection periods and increased gray scale expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of sub-fields is increased to increase the number of displayable gray scales, then the number of gray scales increases, but the selection time of scanning lines becomes insufficient or driving frequency has to be increased
Solution Approach 1:
The patent divides one field into multiple sub-fields with different period lengths (first group with period T1 and second group with period T2 where T2 > T1). This segmentation allows different scanning line groups to operate with different time allocations, ensuring that scanning lines in the second group have sufficient selection time while still achieving high gray scale precision through the combined effect of multiple sub-fields.
Solution Approach 2:
The patent applies different period lengths to different groups of scanning lines based on their specific requirements. Scanning lines in the first group use a shorter period T1 while scanning lines in the second group use a longer period T2. This local differentiation optimizes the selection time for each group, ensuring that all scanning lines receive adequate selection time without requiring a uniform increase in driving frequency across the entire display.
2Manufacturing precision
If the number of sub-fields is increased to increase the number of displayable gray scales, then the number of gray scales increases, but the driving frequency has to be increased
Solution Approach 1:
The patent segments the field into multiple sub-fields with different period lengths, allowing the system to achieve high gray scale precision without uniformly increasing the driving frequency. By having scanning lines operate in different time groups (first group with period T1, second group with period T2), the overall driving frequency can be maintained at acceptable levels while still providing sufficient time for pixel selection and gray scale expression.
Solution Approach 2:
The patent changes the time parameter (period length) for different groups of scanning lines. Instead of using a uniform period for all sub-fields, the system varies the period length between the first group (T1) and second group (T2) of scanning lines. This parameter variation allows the system to accommodate a larger number of sub-fields for higher gray scale precision without proportionally increasing the driving frequency, as different scanning lines operate at different effective frequencies based on their group assignment.
Data Source
AI summary
An electro-optic device which includes pixels disposed in regions corresponding to intersections between a plurality of scanning lines (Rreal) and a plurality of data lines, the pixels being turned on or off in accordance with data signals, each of the data signals being supplied to the plurality of data lines when the plurality of scanning lines (Rreal) are selected, in which one field is divided into a plurality of sub-fields (Nsf) and the plurality of sub-fields (Nsf) are classified into a first group having a period length formed by equally dividing the one field into a plurality of slots, such that a number of slots in the one field is a division number (Ndiv), and a second group having a period length that is at least four times longer than a period length the first group.