Interference Filters for Display Panel Color Saturation
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Solution Overview
Problem
Existing all-color display panels, such as LCD and OLED, suffer from low saturation and narrow color gamut, which limits their display effect.
Innovation Solution
A display panel design featuring a first substrate with pixels comprising sub-pixels in different colors, each equipped with interference filters that transmit light in narrow bands corresponding to their colors, enhancing color saturation and gamut through band-pass filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional color filters are used in LCD and OLED display panels, then the display can show all colors, but the color saturation is low and the color gamut is narrow
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional broad-band color filters to narrow-band interference filters. The interference filters are designed with specific optical parameters (narrow passband width, centered wavelengths matching sub-pixel emissions) to selectively transmit only the desired color wavelengths while blocking others, thereby dramatically improving color saturation and expanding the displayable color gamut beyond what conventional filters can achieve.
2Illumination intensity
If interference filters with narrow passbands are introduced to improve color saturation, then the color gamut is extended, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the display into multiple sub-pixels (red, green, blue) within each pixel, with each sub-pixel equipped with its own dedicated interference filter tuned to its specific wavelength. This segmentation allows each filter to be optimized for a narrow bandwidth, achieving high color saturation while maintaining manufacturability through standardized filter designs that can be mass-produced and assembled.
3Ease of manufacture
If conventional broad-band color filters are used, then the manufacturing process is simpler, but the color emission is less pure and saturation is lower
Solution Approach 1:
The patent achieves high manufacturing precision by precisely controlling the optical parameters of the interference filters, specifically the thickness and refractive index of the filter layers, to achieve exact center wavelengths and narrow passband widths. While the manufacturing process becomes more precise, it remains feasible through established thin-film deposition techniques, balancing manufacturing complexity with the need for precise color control.
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
The solution improves color saturation and extends the display color gamut by filtering light in narrow bands, resulting in improved display effects for both liquid crystal and organic light-emitting diode display panels.
Implementation Method 1
interference filters one-to-one corresponding to the sub-pixels on light emitting sides of the sub-pixels, and configured to transmit light in narrow bands in same colors as the corresponding sub-pixels
Data Source
AI summary
A display panel, a method for fabricating the same, and a display device are provided. The display panel includes: a first substrate, and a plurality of pixels in an array on the first substrate, where each pixel includes a plurality of sub-pixels in different colors, and interference filters one-to-one corresponding to the sub-pixels are arranged on light emitting sides of the sub-pixels, and configured to transmit light in narrow bands in the same colors as the corresponding sub-pixels. The interference filters corresponding to the colors of light emitted from the sub-pixels are arranged on the light emitting sides of the sub-pixels so that the light in the narrow bands in the corresponding colors are transmitted, thus improving the saturation of the colors of the emitted light, extending the display color gamut of the display panel, and optimizing the display effect.