Liquid Crystal Display Panel Light-Shading Layer Design
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Solution Overview
Problem
In liquid crystal display panels using the black column space (BCS)/black matrix (BM) less technology, light leakage occurs in the transmitting area due to the absence of a black matrix, which affects display quality.
Innovation Solution
A liquid crystal display panel design that includes a light-shading layer made of a black matrix positioned on the first transparent conductive layer within the transmitting area, aligned with transparent portions of the metal layer to prevent light leakage, along with conductive particles and a sealant to connect substrates and cure the sealant effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If black matrix is omitted to simplify manufacturing process and reduce cost, then manufacturing complexity and cost are reduced, but light leakage occurs in transmitting area affecting display quality
Solution Approach 1:
The patent merges the light-shading function and signal transmission function into the metal layer structure. The metal layer simultaneously serves as the common electrode for signal transmission and as the light-shading element, eliminating the need for a separate black matrix layer while preventing light leakage in the transmitting area.
Solution Approach 2:
The metal layer is designed to perform multiple functions: it acts as the common electrode for receiving common signals, provides light-shading to prevent light leakage, and serves as a structural component of the display panel. This multi-functional design resolves the contradiction by eliminating the need for separate dedicated layers.
2Ease of manufacture
If black matrix is omitted to reduce manufacturing cost, then production cost is reduced, but display quality deteriorates due to light leakage
Solution Approach 1:
The patent combines the light-shading function and signal transmission function into the metal layer structure. The metal layer simultaneously serves as the common electrode for signal transmission and as the light-shading element, eliminating the need for a separate black matrix layer while preventing light leakage in the transmitting area.
Solution Approach 2:
The metal layer is designed with specific optical properties to provide light-shading effects. By controlling the metal layer's characteristics, it achieves the necessary light-blocking performance in the transmitting area while maintaining electrical conductivity for signal transmission, thus preserving display quality without additional cost.
3Object-affected harmful factors
If spacers are made of black material to achieve light-shading effect, then light-shading performance is improved, but signal transmission becomes difficult in transmitting area
Solution Approach 1:
The patent merges the light-shading function and signal transmission function into the metal layer structure. The metal layer simultaneously serves as the common electrode for signal transmission and as the light-shading element, eliminating the need for a separate black matrix layer while preventing light leakage in the transmitting area.
Solution Approach 2:
The metal layer is designed with different properties in different regions: in the transmitting area, it provides both electrical conductivity for signal transmission and light-shading properties; in the display area, it serves primarily as the common electrode. This local differentiation resolves the contradiction between light-shading and signal transmission.
Data Source
AI summary
A liquid crystal display (LCD) panel and an LCD device are provided. The panel has: a metal layer having transparent portions configured to conveniently cure a sealant and opaque portions; a second transparent conductive layer; and conducting particles positioned between a first substrate and a second substrate and configured to connect a first transparent conductive layer with the second transparent conductive layer. A light-shading layer is aligned with the transparent portions, so that light leakage of the transparent portions is prevented.