Field Sequential Display Light Leakage Reduction
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Solution Overview
Problem
The field sequential drive method for liquid crystal display devices narrows the color gamut due to light leakage from other color sources, even when displaying a single color, as it does not require a color filter but still suffers from interference from green and blue light sources.
Innovation Solution
A display device with a light modulation layer using polymer dispersed liquid crystals and a drive circuit that controls the quantity of light from each light source based on image signal analysis, either by modulating the pulse width of the voltage applied or the current supplied to the light sources, to minimize light leakage and enhance color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If field sequential drive method is used to eliminate color filters, then transmissivity is improved, but color gamut is narrowed due to light leakage from other color sources
Solution Approach 1:
The patent extracts and eliminates the color filter component from the liquid crystal display device, replacing it with a field sequential drive method that uses time-division multiplexing of red, green, and blue light sources to achieve color display without requiring physical color filtering layers
Solution Approach 2:
The patent implements periodic action by sequentially activating different colored light sources (red, green, blue) in a time-division manner during each frame period, with each color displayed for a specific time interval (e.g., 1/3 of the frame period), creating a periodic illumination pattern that enables color display through temporal multiplexing
2Illumination intensity
If all color light sources are turned on simultaneously, then brightness is improved, but color accuracy deteriorates due to interference from other colors
Solution Approach 1:
The patent applies periodic action by sequentially activating different colored light sources (red, green, blue) in a time-division manner during each frame period, with each color displayed for a specific time interval (e.g., 1/3 of the frame period), creating a periodic illumination pattern that enables color display through temporal multiplexing
Solution Approach 2:
The patent implements dynamics by making the light source activation pattern time-dependent and adaptive, where the illumination intensity and timing of each color source are dynamically adjusted based on the display requirements and color reproduction needs, allowing flexible control over the temporal distribution of light
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 approach improves the color gamut by reducing light leakage from unwanted color sources, resulting in clearer and more accurate color displays without the need for a color filter, while maintaining high transmissivity.
Implementation Method 1
a liquid crystal layer interposed between the first and second substrates, to which light from the light sources enters
Data Source
AI summary
According to one embodiment, a display device including a plurality of light sources of different luminous colors, a first substrate, a second substrate opposed to the first substrate, a liquid crystal layer interposed between the first and second substrates, to which light from the light sources enters, a display area on which an image is displayed, and a drive circuit configured to control quantity of light from each of the light sources on the basis of an analyzation result of an image signal used to display the image.