Color Filter Colorant Ratios for Display Gamut
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Solution Overview
Problem
The existing organic light emitting display devices have limitations in color gamut, as the current color filters cannot satisfy the diverse color demands of users, restricting the range of colors that can be displayed.
Innovation Solution
The use of specific combinations of colorants in blue, green, and red color filters, represented by particular chemical formulas, with optimized weight ratios and thicknesses, to enhance the color gamut by optimizing the peak wavelengths and position of colors on the color coordinates, thereby improving the display's color reproduction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional color filters are used in organic light emitting display devices, then the device structure is simple and manufacturing is easier, but the color gamut is limited and cannot satisfy diverse color demands
Solution Approach 1:
The patent applies composite materials by combining multiple colorants (cyan, yellow, magenta, and/or purple) in specific weight ratios within the color filter. This composite approach enables the filter to selectively transmit multiple wavelength ranges simultaneously, thereby expanding the color gamut while maintaining a single-layer filter structure that does not significantly increase device complexity
Solution Approach 2:
The patent utilizes parameter changes by optimizing the weight ratios of different colorants (e.g., cyan colorant 5-50%, yellow colorant 45-95%) and controlling the thickness of the color filter layer (200-500 nm). These parameter adjustments enable precise control over the transmission spectrum, allowing the filter to achieve enhanced color gamut coverage while maintaining manufacturing feasibility
2Manufacturing precision
If conventional color filters with limited wavelength selection are used, then the manufacturing process is simpler, but the color sharpness and coordinate precision are insufficient
Solution Approach 1:
The patent achieves improved color coordinate precision by optimizing parameters including the weight ratios of colorants (cyan 5-50%, yellow 45-95%, magenta 10-80%, purple 5-50%), the thickness of the color filter layer (200-500 nm), and the peak wavelengths of individual colorants. These controlled parameter variations enable precise positioning of color coordinates (e.g., blue: 440-480 nm, green: 500-560 nm, red: 600-680 nm) while maintaining a manufacturable single-layer structure that does not significantly complicate the fabrication process
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 allows for an enhanced color gamut by ensuring only specific wavelengths pass through each color filter, resulting in improved color sharpness and coordinates, which can increase the range of colors displayed, addressing the limitations of existing technologies.
Implementation Method 1
only desired-colored light is emitted through the substrate 10 when the emitted white (W) light passes through the color filter 30
Data Source
AI summary
Disclosed is a display device comprising a blue color filter including a blue colorant and a purple colorant, whereby a position of a blue color is optimized on color coordinates, and a sharpness of a peak wavelength of the blue color is more enhanced, thereby improving a color gamut.