Dual Light Blocking Member for LCD Edge Leakage
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Solution Overview
Problem
Liquid crystal displays experience light leakage issues due to the lack of effective light blocking mechanisms at the outer edges, which affect contrast ratio and overall display performance.
Innovation Solution
The implementation of a dual light blocking member system, where a first light blocking member formed by a half tone mask and a second light blocking member formed by a full tone mask, along with a dam structure, are used to prevent light leakage by serving as both a black matrix and column spacer, with specific configurations to manage the boundary and thickness to minimize misalignment and optical density loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is formed in a matrix shape across the entire surface of the panel to prevent light leakage, then light leakage prevention is improved, but manufacturing complexity and alignment precision requirements increase
Solution Approach 1:
The light blocking member is divided into a first light blocking member (formed by half tone mask) and a second light blocking member (formed by full tone mask). This segmentation allows different regions to be formed with different precision requirements, reducing overall manufacturing complexity while maintaining effective light leakage prevention.
Solution Approach 2:
Different regions of the light blocking member are formed with different properties: the first light blocking member uses half tone mask for regions requiring moderate density, while the second light blocking member uses full tone mask for regions requiring maximum light blocking. This local differentiation optimizes both manufacturing ease and light leakage prevention effectiveness.
2Device complexity
If the light blocking member serves as both black matrix and column spacer, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The light blocking member combines the functions of black matrix and column spacer into a single integrated structure. This merging reduces the number of separate components and simplifies the overall device structure, while the dual-mask formation process ensures proper boundary alignment between different functional regions.
Solution Approach 2:
The light blocking member performs multiple functions simultaneously: it acts as a black matrix for light blocking, as a column spacer for maintaining pixel electrode spacing, and as a structural element for defining pixel boundaries. This multi-functionality reduces device complexity while the specific formation process addresses precision requirements.
3Ease of manufacture
If a half tone mask is used to form the first light blocking member, then manufacturing ease is improved, but optical density and light blocking effectiveness deteriorate
Solution Approach 1:
The light blocking member is segmented into regions formed by different mask types. The half tone mask forms the first light blocking member where moderate optical density is sufficient, while the full tone mask forms the second light blocking member where maximum light blocking is required. This segmentation balances manufacturing ease with light blocking effectiveness.
Solution Approach 2:
The light blocking member has a composite structure with regions of different optical densities. The first region (half tone) provides moderate blocking for areas where complete blocking is not critical, while the second region (full tone) provides complete blocking for critical areas. This composite approach optimizes both manufacturing and performance.
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 efficiently prevents light leakage at the outer edges of the liquid crystal display, enhancing the contrast ratio and optical performance by effectively blocking light and maintaining the alignment of liquid crystal molecules.
Implementation Method 1
a first light blocking member disposed on the dummy pixel and the pixel pattern; a second light blocking member adjacent to the first light blocking member
Data Source
AI summary
A liquid crystal display includes: a first substrate; a plurality of pixels disposed on the first substrate; a dummy pixel disposed on the first substrate and disposed at an outer side of the plurality of pixels; a pixel pattern disposed on the first substrate and disposed at an outer side of the dummy pixel; a first light blocking member disposed on the dummy pixel and the pixel pattern; a second light blocking member adjacent to the first light blocking member and having a part disposed on the pixel pattern at a predetermined first thickness; a second substrate facing the first substrate; a common electrode disposed on the second substrate and configured to be applied with a common voltage; and a liquid crystal layer disposed between the first substrate and the second substrate.