Blue Filter Shape for LCD Luminance
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Solution Overview
Problem
Conventional liquid crystal displays suffer from excessive yellowish images and reduced luminance due to significant light loss of blue wavelengths, which is caused by the lateral emission of blue light.
Innovation Solution
The shape of the blue color filter is modified to have a parabolic, semicircular, trapezoidal, or saw-toothed cross-section, altering the angle of emitted light to reduce lateral light loss and increase the luminance of blue wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional rectangular blue filter is used, then the manufacturing process is simple, but significant light loss of blue wavelengths occurs due to lateral emission
Solution Approach 1:
The blue filter is designed with a curved cross-sectional shape (parabolic, semicircular, trapezoidal, or saw-toothed) instead of a conventional rectangular shape. This curvature modifies the light emission angle, directing blue light more effectively toward the viewer and reducing lateral light loss, thereby improving luminance without significantly complicating the manufacturing process
2Illumination intensity
If the blue filter emits light laterally, then the filter structure is simple, but the luminance of blue wavelengths is reduced
Solution Approach 1:
The invention changes the geometric parameters of the blue filter by modifying its cross-sectional shape from rectangular to curved forms (parabolic, semicircular, trapezoidal, or saw-toothed). This parameter change alters the light emission characteristics, increasing blue wavelength luminance while maintaining compatibility with existing manufacturing processes through standard photolithography and etching techniques
3Object-affected harmful factors
If a rectangular color filter arrangement is used, then the pixel structure is uniform and simple, but yellowish images result due to blue light loss
Solution Approach 1:
The invention applies a specific curved cross-sectional shape (parabolic, semicircular, trapezoidal, or saw-toothed) locally to the blue filter, while the red and green filters maintain conventional rectangular shapes. This localized shape modification compensates for the selective blue light loss, restoring color balance and preventing yellowish image distortion without requiring changes to the entire pixel structure
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 configuration enhances the lateral luminance of blue wavelengths, preventing undesirably yellowish images and improving overall display luminance by refracting and dispersing light more effectively.
Implementation Method 1
improving overall display luminance by refracting and dispersing light more effectively
Implementation Method 2
improving overall display luminance by refracting and dispersing light more effectively
Data Source
AI summary
An exemplary embodiment of the present invention provides a liquid crystal display, including: a first substrate; a second substrate facing the first substrate; a liquid crystal layer formed between the first substrate and the second substrate; and a first color pixel area, a second color pixel area, and a third color pixel area formed on the first substrate or the second substrate, wherein the first, second, and third color pixel areas respectively include one of a red filter, a green filter, and a blue filter, and a cross-section of the blue filter has an at least approximately parabolic or semicircular shape. According to exemplary embodiments of the present invention, it is possible to prevent excessively yellow images and improve luminance thereof by changing a shape of a blue color filter included in the liquid crystal display.