Curved LCD Light Directing Elements for Leakage Control
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Solution Overview
Problem
In curved liquid crystal display panels, misalignment between the CF substrate and the TFT substrate leads to light leakage through bordering areas, resulting in reduced contrast ratio due to the need for broader masking elements, which further decreases the aperture size.
Innovation Solution
Incorporating light directing elements with reflective surfaces between the CF and TFT substrates to condense and redirect light beams from pixel areas to corresponding aperture areas, thereby maintaining optimal alignment and aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If broader masking elements are used to prevent light leakage, then light leakage is reduced, but aperture size decreases and contrast ratio is reduced
Solution Approach 1:
The patent introduces a light redirecting layer as an intermediary component between the pixel electrode and color filter. This layer contains light redirecting particles that mediate the light path, reflecting leaked light from bordering areas back through the liquid crystal layer to prevent it from reaching neighboring filter cells, thereby reducing light leakage without requiring broader masking elements
Solution Approach 2:
The patent changes the optical parameters of the medium between substrates by incorporating light redirecting particles with specific refractive indices (higher than both the liquid crystal and polymer materials). This parameter change enables the particles to reflect light effectively, altering the light path and preventing light leakage without affecting aperture size
2Object-affected harmful factors
If masking elements are made broader to eliminate light leakage, then light leakage is eliminated, but contrast ratio is reduced
Solution Approach 1:
The light redirecting layer acts as an intermediary that actively manages light paths. The light redirecting particles within this layer reflect light from bordering areas back through the liquid crystal layer, preventing it from reaching neighboring filter cells. This eliminates light leakage while preserving the original masking element dimensions and aperture size, thereby maintaining optimal contrast ratio
Solution Approach 2:
The patent converts the harmful light leakage from bordering areas into a beneficial effect by using light redirecting particles to reflect this light back through the liquid crystal layer. The reflected light is redirected to its intended filter cell rather than leaking to neighbors, thereby eliminating the harmful effect while maintaining aperture size and contrast ratio
3Object-affected harmful factors
If aperture size is reduced to prevent light leakage, then light leakage is prevented, but contrast ratio is reduced
Solution Approach 1:
The light redirecting layer serves as an intermediary that prevents light leakage without requiring aperture reduction. The light redirecting particles reflect light from bordering areas back through the liquid crystal layer, ensuring that light only reaches its intended filter cell. This maintains the original aperture size while preventing light leakage, thereby preserving optimal contrast ratio
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 solution enhances the contrast ratio of curved liquid crystal display panels by effectively directing light beams, reducing light leakage and maintaining optimal aperture sizes, thus improving image quality without sacrificing contrast.
Implementation Method 1
light directing elements with reflective surfaces are arranged between the CF substrate and the TFT substrate to direct part of the light beam transmitted through a pixel area toward the corresponding aperture area
Implementation Method 2
the reflective surfaces of the light directing elements are arranged to condense at least a part of said light beam segment so as to reduce the beam cross-section of said light beam segment
Data Source
AI summary
A liquid crystal display has a plurality of light directing elements located between the CF substrate and the TFT substrate. The TFT substrate has a plurality of pixel areas and a plurality of bordering areas between adjacent pixel areas. The CF substrate has a plurality of apertures corresponding to the pixel areas and a plurality of masking elements between adjacent aperture areas. Each of the masking elements is broader than the corresponding bordering area on the TFT substrate. The light directing elements with reflective surfaces are used to condense part of the light beam transmitted through a pixel area so as to reduce the beam width of the light beam as it reaches the corresponding aperture. The light directing elements can be located on the CF substrate or the TFT substrate.