Liquid Crystal Display Light Absorption Layer for Color Shift Reduction
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Solution Overview
Problem
Field sequential color (FSC) liquid crystal display devices experience significant color shift when operating in reflective or micro reflective modes, particularly noticeable at larger viewing angles and high gray levels, due to the energy distribution of blue-green colors in sunlight.
Innovation Solution
Incorporating a light absorption layer between the substrates of the liquid crystal panel to absorb light within the 380 nm to 560 nm wavelength range, and utilizing a timing control backlight module to adjust light-emitting devices, which can include turning on red and blue light-emitting devices simultaneously to compensate for color shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If FSC liquid crystal display device operates in reflective mode utilizing sunlight, then the device can display images without backlight system, but blue-green color shift occurs at specific viewing angles due to higher energy distribution of blue-green region in sunlight
Solution Approach 1:
The patent extracts and removes the harmful blue-green wavelength components (380-560 nm) from the sunlight spectrum using a light absorption layer. This selective extraction of problematic wavelengths eliminates the cause of color shift while preserving the beneficial energy-saving reflective mode operation.
Solution Approach 2:
The light absorption layer acts as an intermediary component between the sunlight source and the liquid crystal display panel. It mediates the interaction by selectively absorbing blue-green wavelengths, thereby preventing color shift without completely blocking the sunlight or requiring active backlight illumination.
2Ease of manufacture
If FSC liquid crystal display device uses color filters to achieve color mixing, then color display can be achieved, but pixel structure becomes complex and resolution is reduced
Solution Approach 1:
The patent removes the color filter layer from the pixel structure, extracting the problematic component that caused both manufacturing complexity and resolution loss. The color mixing function is instead achieved through temporal sequencing of backlight colors, eliminating the need for spatial color filters.
Solution Approach 2:
The patent implements periodic temporal sequencing of red, green, and blue backlight emissions to achieve color mixing. This time-domain approach replaces the space-domain color filter method, allowing full-resolution pixels without color filter complexity while maintaining color display capability through persistence of vision.
3Stability of the object's composition
If light absorption layer covers 380 nm to 560 nm wavelength range, then blue-green color shift is reduced, but overall light transmittance decreases
Solution Approach 1:
The light absorption layer is designed with localized wavelength selectivity, absorbing only the specific blue-green range (380-560 nm) that causes color shift while allowing other wavelengths to pass through. This local quality approach targets only the problematic spectral region rather than uniformly blocking all light.
Solution Approach 2:
The patent optimizes the absorption characteristics of the light absorption layer by adjusting its material composition and thickness parameters. This enables selective absorption of blue-green wavelengths while minimizing impact on overall transmittance, achieving color stability without excessive light loss.
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
Effectively reduces color shift by filtering blue-green light and adjusting gray levels or light emission, improving color stability across various viewing angles and gray levels.
Implementation Method 1
the light absorption layer is configured to absorb a light having a wavelength within a range between 380 nm and 560 nm
Data Source
AI summary
The present invention provides a liquid crystal display device including a liquid crystal panel. The liquid crystal panel has a plurality of pixel regions, and the liquid crystal panel includes a first substrate, a second substrate, a liquid crystal layer, and a light-absorbing layer. The second substrate and the first substrate are disposed opposite to each other, and the liquid crystal layer is disposed between the first substrate and the second substrate. The light-absorbing layer is disposed between the first substrate and the second substrate in the pixel regions, and the light-absorbing layer is configured to absorb a light having a wavelength within a range between 380 nm and 560 nm.