Electro-Optical Device Driving Method for Grayscale Uniformity
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Solution Overview
Problem
The phase-developed driving method for projectors can result in deterioration of display quality due to a vertical stripe pattern caused by uneven grayscale levels across grouped data lines, making it challenging to achieve high-definition displays without compromising image quality.
Innovation Solution
A method of driving electro-optical devices where scan lines are selected in a predetermined order, with time periods divided into first and second periods, and data lines are alternately selected from odd and even groups to sample and supply data signals, effectively minimizing the visibility of display quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the phase-developed driving method is used to increase data signal supply time for higher definition displays, then the writing time to pixels is sufficient, but vertical stripe patterns appear causing display quality deterioration
Solution Approach 1:
The data lines are divided into multiple groups (first group, second group, third group) with different numbers of lines (e.g., 2, 3, 4 lines respectively). This segmentation allows each group to be driven with different timing phases, distributing the grayscale variation across multiple groups rather than having uniform groups that create visible stripe patterns. The segmentation principle resolves the contradiction by maintaining sufficient write time while preventing periodic grayscale artifacts.
Solution Approach 2:
Different groups of data lines are assigned different operational characteristics - specifically, different numbers of lines per group and different phase delays. This creates local variations in the driving scheme that prevent uniform stripe patterns from forming across the entire display. The local quality principle allows the system to maintain overall grayscale uniformity while providing sufficient write time to each pixel.
2Measurement precision
If the number of scan lines and data lines is increased for higher definition, then image resolution is improved, but the time period for selecting data lines is shortened making data writing insufficient
Solution Approach 1:
The driving method uses periodic phase development where data lines are selected in repeated cycles across multiple groups. Each group of data lines is selected in sequence with different phase offsets, creating a periodic pattern that extends the effective data writing time. This periodic action allows higher definition displays to receive sufficient data writing time by distributing the selection process across multiple phases rather than attempting to select all lines simultaneously.
3Loss of time
If data lines are grouped together for phase-developed driving to extend selection time, then data writing time is sufficient, but grayscale levels become uneven across grouped lines causing visible stripes
Solution Approach 1:
The data lines are intentionally grouped asymmetrically with different numbers of lines in each group (e.g., 2, 3, 4 lines per group rather than uniform grouping). This asymmetric grouping breaks the periodicity that would otherwise create uniform stripe patterns. Combined with different phase delays for each group, the asymmetry ensures that grayscale variations are distributed irregularly across the display, making them imperceptible to the human eye.
Data Source
AI summary
A method of driving an electro-optical device having a plurality of pixels which are formed to correspond to intersections between a plurality of scan lines and a plurality of data lines and each of which exhibits a grayscale of output light corresponding to a data signal sampled and supplied to the corresponding data line when the corresponding scan line is selected is provided. The method includes: selecting the plurality of scan lines in a predetermined order; dividing a period of time, when one of the scan lines is selected, into a first period and a second period; selecting m (where m is an integer greater than or equal to 2) lines from one of an odd group and an even group consisting of odd-numbered and even-numbered data lines, respectively, in the first period; selecting m data lines from the other of the odd group and the even group of data lines in the second period; and sampling data signals supplied to m image signal lines and supplying the sampled data signals to the selected m data lines.