LCD Color Layer Contrast Optimization for Bluish Black Leakage
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) suffer from reduced image quality due to significant changes in color tone, particularly on the low-key side near black, caused by the properties of color filters and polarizing plates, leading to color balance breakdown and bluish black displays.
Innovation Solution
The solution involves forming red, green, and blue color layers on a transparent substrate with specific contrast relationships (16×(CRR/CRG)−3>CRB/CRG>CRR/CRG) and optimizing the polarizing plate contrast, ensuring a total contrast ratio of CRR, G, B/CRPOL≧0.11, to maintain high contrast and minimize color difference between white and black plain colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the contrast of blue color layer is increased to match red and green, then color balance at white plain color is improved, but light leakage at black plain color increases causing bluish display
Solution Approach 1:
The patent applies different contrast requirements to different color layers (R, G, B) rather than uniform treatment. Specifically, it sets the blue color layer contrast CRB within a specific range (0.85-1.15 times CRG) while setting red and green contrasts to satisfy CRG/0.95<CRB<CRG/0.85, creating localized quality differences that balance white display while controlling black display characteristics
Solution Approach 2:
The patent changes the contrast parameters of color layers and polarizing plates to resolve the contradiction. By setting specific contrast relationships (CRR/CRG<1.05, CRB/CRG within 0.95-1.05) and polarizing plate contrast (CRPOL≥1000), it achieves both balanced white display and reduced blue light leakage at black display
2Manufacturing precision
If scattering is increased to suppress color difference at black plain color, then color balance is improved, but depolarization factor increases reducing panel contrast
Solution Approach 1:
The patent changes the contrast parameters of color layers and polarizing plates to resolve the contradiction. By setting specific contrast relationships (CRR/CRG<1.05, CRB/CRG within 0.95-1.05) and polarizing plate contrast (CRPOL≥1000), it achieves both balanced white display and reduced blue light leakage at black display
3Ease of manufacture
If conventional polarizing plate with iodine staining is used, then manufacturing is simple, but transmissivity is higher on short-wavelength side causing bluish black display
Solution Approach 1:
The patent changes the contrast parameter of the polarizing plate by specifying CRPOL≥1000, which ensures sufficient contrast to suppress blue light leakage at black plain color while maintaining manufacturability through standard staining processes
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 results in a liquid crystal display with high contrast and improved image quality, reducing color differences between white and black plain colors, thereby enhancing overall image quality.
Implementation Method 1
the scattering extent of incident light varies with the dispersion state of the pigment particles
Implementation Method 2
degree of depolarization (the extent the polarization is eliminated) varies
Data Source
AI summary
A liquid crystal display with high contrast and little color difference between white plain color and black plain color is disclosed, in which in the color layers formed on an optically transparent substrate, the contrasts of red (R), green (G), and blue (B) CRR, CRG, and CRB have a relationship of 16×(CRR/CRG)−3>CRB/CRG>CRR/CRG, and the total contrast CRR, G, B calculated from the contrasts of color layers CRR, CRG, and CRB and the contrast of a polarizing plate CRPOL satisfy a relationship of CRR, G, B/CRPOL>0.11.