Field Sequential Display Shifting Write Start Position
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Solution Overview
Problem
Field sequential liquid crystal display devices often suffer from color breakup due to low frame rates, which can result in unintended color variations visible to the human eye.
Innovation Solution
A display device configuration that includes a liquid crystal display panel with a light source, where one frame period is divided into multiple sub-frame periods, and the start position of writing line images is shifted by one line between consecutive sub-frame periods, along with individually controllable light sources for different colors and an inverted electric field polarity cycle, to reduce color breakup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the frame rate is low in a field sequential display device, then the device complexity is reduced, but color breakup occurs due to unintended color variations visible to the human eye
Solution Approach 1:
The frame period is divided into multiple sub-frame periods, and each sub-frame period is further divided into multiple field periods for different colors. This segmentation allows the display to show different color components at different time intervals, reducing color breakup while maintaining manageable device complexity through structured time-division multiplexing
Solution Approach 2:
The patent employs periodic switching of light sources for different colors (red, green, blue) at specific frequencies within each sub-frame period. By synchronizing the light source switching with the liquid crystal response characteristics and using periodic polarity inversion, the system reduces color breakup without requiring excessively high frame rates
2Object-affected harmful factors
If the frame rate is increased to reduce color breakup, then color breakup is reduced, but the scan line signal switching frequency increases
Solution Approach 1:
By dividing the frame into sub-frames and field periods, the patent reduces the switching frequency requirement for each individual scan line signal. The segmentation allows slower switching of scan line signals while maintaining high effective frame rate through time-division multiplexing of color components
Solution Approach 2:
The patent uses periodic polarity inversion at specific intervals (e.g., every other field period) rather than continuous high-frequency switching. This periodic action reduces the average switching frequency of scan line signals while maintaining display quality by exploiting the persistence of vision and liquid crystal response characteristics
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases the frame rate and reduces color breakup by synchronizing the light source lighting with the frame rate, maintaining image quality while minimizing the frequency of scan line signal switching.
Implementation Method 1
a liquid crystal filled between two substrates facing each other and is configured to display a frame image
Implementation Method 2
a light source that is configured to emit light to the display panel
Data Source
AI summary
A display device includes: a display panel to display a frame image by arranging line images; and a light source. One frame period includes sub-frame periods each including a writing period and a display period. The line images are written in units of a predetermined number of lines during the writing period. The line images that are written at a time in units of the predetermined number of lines are the same image. In two continuous sub-frame periods in the one frame period, when a line image to be written during the writing period in a preceding sub-frame period differs from a line image to be written during the writing period in a subsequent sub-frame period, a start position of the writing period in the preceding sub-frame period and a start position of the writing period in the subsequent sub-frame period are shifted by one line from each other.