Fluorescent Color Substrate for Liquid Crystal Display
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Solution Overview
Problem
Conventional liquid crystal displays suffer from low light utilization efficiency and narrow visual angles due to light absorption by resin-based color filters and birefringence technologies, leading to decreased luminance and image quality when viewed from different angles.
Innovation Solution
A color substrate with fluorescent material-based color pixels and a built-in polarizer, which replaces resin material filters and enhances light emission efficiency, allowing for active light stimulation and improved visual angles without complex optical constructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If resin material color filters are used to achieve color display, then color display characteristic is accomplished, but light utilization efficiency decreases sharply
Solution Approach 1:
The patent replaces the passive optical filtering mechanism (resin color filters that absorb light) with an active light emission mechanism (fluorescent materials that convert UV/blue light to visible colors). This substitution fundamentally changes from light absorption to light conversion, achieving color display while dramatically improving light utilization efficiency by over 50%.
Solution Approach 2:
The patent changes the working principle from absorption-based color filtering to emission-based color generation. By using fluorescent materials with specific excitation and emission wavelength characteristics, the system converts high-energy UV/blue photons to lower-energy visible photons, maintaining color display functionality while reducing energy loss.
2Illumination intensity
If conventional back lights with fluorescent powder stimulation are used, then full spectrum light is emitted, but light energy consumption increases due to double stimulation process
Solution Approach 1:
The patent extracts and eliminates the redundant fluorescent powder stimulation stage from the conventional backlight system. Instead of using UV lights to stimulate fluorescent powder which then emits blue light to stimulate another fluorescent powder for full spectrum emission, the invention directly uses blue LED chips to excite the color substrate fluorescent materials, removing one energy conversion stage and reducing overall energy consumption.
Solution Approach 2:
The patent establishes a direct energy transfer pathway from blue LED excitation source to color substrate fluorescent materials, creating a continuous useful action chain. This eliminates the discontinuous double-stimulation process where energy is lost in intermediate conversion stages, thereby improving overall energy utilization efficiency.
3Ease of operation
If birefringence technology is used to control light intensity, then liquid crystal display function is achieved, but visual angle becomes narrow
Solution Approach 1:
The patent inverts the conventional display architecture by placing the light source (fluorescent materials) at the display surface rather than at the back. This inversion allows light to emit directly toward the viewer without passing through the liquid crystal layer, eliminating the optical path difference that causes narrow viewing angles while maintaining light intensity control through liquid crystal modulation before the color conversion stage.
4Area of stationary object
If multiple optical components are added to improve visual angle characteristic, then viewing angle is enhanced, but device structure becomes complex
Solution Approach 1:
The patent extracts and removes the need for complex optical compensation components (such as optical membranes, prisms, or additional liquid crystal layers) that are traditionally required to widen viewing angles. By fundamentally changing the light emission architecture to active fluorescent emission at the display surface, the invention achieves wide viewing angles without adding optical complexity.
Solution Approach 2:
The color substrate with fluorescent materials serves multiple functions simultaneously: it provides color display, achieves wide viewing angles, and maintains energy efficiency. This multi-functional integration eliminates the need for separate optical compensation components, simplifying the overall device structure while achieving multiple performance goals.
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
Increases light energy utilization efficiency by over 50%, enhances display luminance, and maintains color contrast across viewing angles, comparable to active luminescent displays, while reducing the number of optical components and simplifying the display design.
Implementation Method 1
color pixels which are disposed alternately among the black matrices, wherein material of the color pixels is fluorescent material
Implementation Method 2
back lights belonging to white LED type emit lights by stimulating the fluorescent powder coated on the lamp tube wall via shortwave light projected from the diode chip, namely via the purple lights or the blue lights emitted
Implementation Method 3
a built-in polarizer attached to the flat encapsulation layer
Implementation Method 4
the liquid crystal display generally adopts birefringence technology or optical rotation technology to control light intensity
Implementation Method 5
the liquid crystal display generally adopts birefringence technology or optical rotation technology to control light intensity
Data Source
AI summary
Disclosed are a color substrate, a manufacturing method thereof and a liquid crystal display. The color substrate comprises a substrate; black matrices disposed on the substrate; color pixels whose material is fluorescent material disposed alternately among the black matrices; a flat encapsulation layer covering the black matrices and the color pixel; and a built-in polarizer attached to the flat encapsulation layer. The manufacturing method comprises forming black matrices on a substrate, and forming color pixels of fluorescent material among the black matrices; form a flat encapsulation layer; and form a built-in polarizer. The liquid crystal display by using the color substrate of the present invention further comprises a array substrate, a liquid crystal layer and a back light wherein wavelength of light emitted by the back light is shorter than of equal to stimulated luminescence critical wavelength of fluorescent material of the color pixels on the color substrate. In the present invention, the color fluorescent material is used for replacing the color resin material on the color substrate, the lamination mode is changed and the energy loss resulting from light-absorbing of the resin material is decreased, which could increase the light utilization efficiency and improve the visual angle characteristic of the liquid crystal display.