Liquid Crystal Display Light Blocking Insulating Layer
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Solution Overview
Problem
The existing liquid crystal display devices face issues with light leakage near the sealing member, leading to a deterioration in appearance due to insufficient light blocking properties, which can result in shadows of signal and common electrode connection traces, and the use of metal light blocking layers may generate parasitic capacitance.
Innovation Solution
A display device configuration with a light blocking portion in the non-display area, featuring narrow and wide line portions with empty portions to control light transmission and reduce parasitic capacitance, ensuring uniform brightness and improved appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal light blocking layer is formed near the sealing member, then light blocking property is improved, but parasitic capacitance is generated with respect to other traces
Solution Approach 1:
The patent replaces the metal light blocking layer with an insulating material layer having a light blocking function. This substitution eliminates the electrical conductivity that causes parasitic capacitance while maintaining the light blocking capability through the insulating material's optical properties.
Solution Approach 2:
The patent changes the material parameter from conductive metal to insulating material, fundamentally altering the electrical properties while preserving the optical blocking function. This parameter change resolves the parasitic capacitance issue by removing electrical conductivity from the light blocking structure.
2Object-affected harmful factors
If the black matrix thickness is increased to improve light blocking property, then light blocking property is improved, but flatness of the panel is deteriorated or gap error is caused
Solution Approach 1:
The patent changes the material composition parameter by using insulating materials with appropriate refractive indices and optical properties, achieving effective light blocking without increasing physical thickness. This allows maintaining both light blocking performance and panel flatness.
Solution Approach 2:
The patent employs composite insulating material layers that combine light blocking capability with appropriate optical and mechanical properties. These composite materials achieve superior light blocking performance per unit thickness compared to traditional black matrix materials, eliminating the need for increased thickness.
3Object-affected harmful factors
If the density of light blocking material in black matrix is increased to improve light blocking property, then light blocking property is improved, but sensitivity of photosensitive resin material is lowered and it becomes difficult to form the black matrix
Solution Approach 1:
The patent changes the material type from photosensitive resin-based black matrix to insulating materials with inherent light blocking properties. This parameter change eliminates the trade-off between light blocking density and photolithography sensitivity, as the insulating materials do not rely on photosensitive resin for their light blocking function.
Solution Approach 2:
The patent substitutes the photolithography-based black matrix formation process with a process using insulating materials that provide light blocking through their inherent optical properties rather than through photosensitive resin patterning, thereby avoiding the sensitivity issue entirely.
4Reliability
If common electrode connection traces are arranged with solid pattern, then electrical connection is improved, but light blocking property is improved causing traces to be seen as shadow
Solution Approach 1:
The patent changes the optical parameter by using insulating material layers with appropriate refractive indices that reduce light blocking effects. This allows the solid-pattern common electrode connection traces to maintain both electrical connectivity and optical transparency, preventing shadow effects.
Solution Approach 2:
The insulating material layer acts as an intermediary between the common electrode connection traces and the liquid crystal layer, providing electrical insulation while maintaining optical transparency. This intermediary layer allows light to pass through the solid-pattern traces without creating visible shadows.
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
The configuration effectively blocks light leakage, maintains uniform brightness across the display device, and avoids parasitic capacitance issues, thereby enhancing the appearance and reliability of the liquid crystal display.
Implementation Method 1
a light blocking portion disposed in at least the non-display area and configured to block light
Data Source
AI summary
A liquid crystal panel (display panel) 11 includes a display area AA configured to display images, a non-display area NAA outside the display area AA, a light blocking layer (a light blocking portion) 11i disposed at least in the non-display area NAA and configured to block light, a signal line connection line (a narrow line portion) 29 where lines are arranged at intervals in the non-display area NAA, and a common electrode connection line portion (a wide line portion) 30 disposed in the non-display area and having a line width greater than that of the signal line connection line 29 and including empty portions 34.