LCD Panel Blue Sub-Pixel Transmittance Compensation
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices experience color shift due to uneven blue light absorption in the backlight module, leading to significant color differences across the display, particularly in edge-lit types where blue light absorption is high, causing the screen to appear bluish near the light source and yellowish away from it.
Innovation Solution
The solution involves a liquid crystal display panel with pixel units arranged in an array, where blue sub-pixels' areas or light transmittances are gradually increased along the direction away from the side-type backlight source, compensating for blue light absorption and reducing color differences by optimizing the backlight module with a side-type backlight source, aluminum extrusion, light guide plate, and TIR lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight module with light guide plate is used, then uniform light mixing is achieved through total reflection, but blue light is continuously absorbed along the light propagation direction, causing color shift and color difference in the display panel
Solution Approach 1:
The patent applies local quality by making the blue sub-pixel areas or light transmittances non-uniform across the display panel. Specifically, blue sub-pixel areas are increased or light transmittances are enhanced in regions farther from the backlight source, while maintaining standard parameters in regions closer to the source. This spatially varying property compensates for the differential blue light absorption along the light propagation path, thereby reducing color shift while preserving uniform illumination.
2Object-affected harmful factors
If blue sub-pixel areas are increased to compensate for blue light absorption, then color difference is reduced, but pixel unit area uniformity is compromised
Solution Approach 1:
The patent resolves this contradiction by intentionally creating local quality variations in the blue sub-pixel areas. Different regions of the display panel have different blue sub-pixel area ratios to compensate for the non-uniform blue light distribution caused by the backlight module. This approach prioritizes color uniformity over geometric uniformity, as the varying blue sub-pixel areas are strategically designed to achieve consistent color perception across the entire display.
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 blue light transmittance and reduces in-plane color differences, ensuring a more uniform color experience across the LCD device by compensating for blue light absorption, thus meeting specification requirements.
Implementation Method 1
light is propagated within a light guide plate so as to achieve uniform light mixing by use of the characteristic of total reflection within the light guide plate
Implementation Method 2
the light guide plate has inconsistent light absorption at visible wavelengths and the absorption of blue light usually is relatively strong
Data Source
AI summary
The invention provides a liquid crystal display panel and a liquid crystal display device. The liquid crystal display device includes a liquid crystal display panel and an edge-lit backlight module. The liquid crystal display panel includes multiple pixel units arranged in an array and having equal areas. Each pixel unit includes sequentially arranged red sub-pixel, green sub-pixel and blue sub-pixel. Transmittances of blue light of the blue sub-pixels of the pixel units are gradually increased along a direction away from a side-type backlight source of the edge-lit backlight module. Therefore, the invention can increase transmittances of blue light of the blue sub-pixels, compensate the influence of color shift caused by blue light being absorbed in the backlight module and reduce color difference of the liquid crystal display panel.