LCD Panel Light-Shielding Layer Segmentation for Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels face reduced aperture ratios due to broader light-shielding layers used to prevent light leakage from assembly shifts, which affects the light transmission rate and is undesirable for small and medium display devices.
Innovation Solution
The LCD panel design includes a first substrate with a metal layer, passivation layers, a color filter layer, electrode layers, and a light-shielding layer with a filling and supporting part, which reduces light leakage while maintaining a high aperture ratio by strategically positioning the light-shielding layer to cover exposed areas and create a space for liquid crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a broader light-shielding layer is used to prevent light leakage from assembly shift, then light leakage is reduced, but the aperture ratio is reduced and light transmission rate is reduced
Solution Approach 1:
The light-shielding layer is segmented into multiple discrete light-shielding structures (such as dots or small rectangles) rather than a continuous broad layer. These segmented structures are positioned at specific locations where light leakage is most likely to occur, providing targeted light shielding while preserving the aperture ratio in other areas.
Solution Approach 2:
The light-shielding layer is designed with non-uniform thickness or varying coverage in different regions. The light-shielding structures are concentrated in areas prone to assembly shift-related light leakage, while other areas have reduced or no light shielding, thereby maintaining high aperture ratio where light transmission is critical.
2Reliability
If a broader light-shielding layer is used to prevent light leakage, then light leakage is reduced, but the light transmission rate is reduced
Solution Approach 1:
The light-shielding layer is divided into discrete segments that only occupy necessary areas to prevent light leakage. This segmentation ensures that light can transmit freely through the majority of the aperture area, maintaining high light transmission rate while still providing effective light leakage prevention at critical locations.
Solution Approach 2:
The patent converts the potential harm of assembly shift into a beneficial design feature by positioning light-shielding structures at specific locations that correspond to common assembly shift patterns. This allows the light-shielding layer to address the specific problem of assembly shift-related light leakage without unnecessarily reducing overall light transmission.
Data Source
AI summary
A liquid crystal display panel is disclosed, which comprises: a first substrate with a metal layer formed thereon; a first passivation layer, formed on the metal layer; a color filter layer with a first opening, disposed on the first passivation layer; a first electrode, formed on the color filter layer; a second passivation layer with a second opening, disposed on the first electrode layer and covering partial sidewall of the first opening, wherein the second opening corresponds to the first opening to expose the metal layer; a second electrode layer disposed on the second passivation layer and electrically connecting to the metal layer; a second substrate opposite to the first substrate; and a light-shielding layer, disposed between the first substrate and the second substrate and comprising a filling part, wherein the filling part is disposed in the second opening and covers the exposed color filter layer.