Quantum Dot Color Filter for High Purity Displays
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Solution Overview
Problem
Conventional color filters have limited gamut, affecting display quality and are costly, and existing quantum dot applications in displays face challenges in enhancing color purity without increasing power consumption.
Innovation Solution
A quantum dot color filter comprising a base substrate with pixel layers of red, green, and blue sub-pixels made of quantum dot materials, and an optical filtering layer that absorbs unexcited light, paired with a backlight source emitting light of a smaller wavelength than the quantum dots, to enhance color purity and brightness while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the color purity of a color filter is improved to expand the color gamut, then the color gamut is expanded, but the transmittance of the color filter degrades
Solution Approach 1:
The patent changes the material parameter of the color filter from conventional dyes to quantum dot materials. Quantum dots have size-dependent bandgap properties that enable precise color tuning while maintaining high transmittance. By controlling the size and composition of quantum dots, the patent achieves both high color purity and high transmittance simultaneously, resolving the trade-off between color gamut expansion and light transmission.
2Illumination intensity
If the brightness of a backlight source is enhanced to compensate for degraded color filter transmittance, then the transmittance issue is compensated, but the power consumption of the LCD increases
Solution Approach 1:
The patent changes the material parameter of the color filter to quantum dots, which have superior optical properties including high quantum efficiency and narrow emission spectra. This material change enables the color filter to maintain high transmittance while achieving high color purity, thereby eliminating the need to increase backlight brightness and avoiding the associated increase in power consumption.
3Manufacturing precision
If quantum dots are applied to a backlight source, then the color purity can be improved without increasing color concentration of a color filter, but the structure becomes more complex
Solution Approach 1:
The patent merges the quantum dot layer with the color filter layer into a single integrated structure. The quantum dots are deposited directly onto the color filter substrate, combining the light-emitting function of quantum dots with the color separation function of the filter. This integration approach achieves high color purity while avoiding the need for separate quantum dot backlight units, thereby controlling structural complexity.
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 display quality by expanding the color gamut, enhancing brightness, and reducing production costs by effectively filtering unexcited light and optimizing the use of quantum dots for RGB colors.
Implementation Method 1
an optical filtering layer provided on the base substrate, which is disposed to correspond to the color sub-pixel formed of the quantum dot material, and configured to absorb the incident light that fails to excite the quantum dot material
Implementation Method 2
Quantum dots have distinctive characteristics: they can emit light when subjected to an electrical or optical stimulation so as to produce bright light and present a pure color
Data Source
AI summary
A quantum dot color filter, comprising: a base substrate (11); a pixel layer (14) provided on the base substrate (11), comprising a plurality of pixels, wherein each of the pixels comprises a plurality of color sub-pixels (14R, 14G, 14B) of different colors, and at least one of the color sub-pixels (14R, 14G, 14B) is formed of a quantum dot material, and a color of light generated by the quantum dot material after the quantum dot material is excited by incident light (80) is the same as a color of the color sub-pixel (14R, 14G 14B) corresponding to the quantum dot material; an optical filtering layer (12) provided on the base substrate (11), which is disposed to correspond to the color sub-pixel formed of the quantum dot material, and configured to absorb the incident light (80) that fails to excite the quantum dot material but is transmitted through the color sub-pixel (14R, 14G, 14B). The quantum dot color filter has increased transmittance, and improved and enriched brightness and color of a picture. A manufacturing method concerning the quantum dot color filter and a display apparatus are further provided.