Liquid Crystal Display Light Blocking Member and Spacer Design
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Solution Overview
Problem
In liquid crystal display devices, the alignment of pixel electrodes and color filters on different substrates can lead to alignment errors, and the size of the black matrix affects the aperture ratio, while non-uniform cell gaps result in image quality defects, necessitating a solution for uniform spacer density to maintain image quality and prevent light leakage.
Innovation Solution
A liquid crystal display device design with a first substrate featuring a light blocking region, data lines, and color filters overlapping in boundary regions, where the data lines and color filter overlapping portions are spaced apart from each other, and a light blocking member extending horizontally to cover the first light blocking region, ensuring uniform spacer density and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel electrode and color filters are disposed on different substrates, then alignment accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the pixel electrode and color filters onto the same substrate (first substrate), eliminating the need for separate substrate alignment processes. This integration simplifies the overall manufacturing process while maintaining alignment accuracy through unified patterning operations.
2Reliability
If black matrix size is increased to improve adhesion margin, then substrate adhesion is improved, but aperture ratio decreases
Solution Approach 1:
The patent applies different thicknesses to the light blocking member in different regions: a first thickness in the first region (where spacers are located) and a second, greater thickness in the second region (where no spacers are present). This local variation allows the black matrix to provide enhanced adhesion where needed while minimizing impact on the aperture ratio in the display region.
3Manufacturing precision
If step difference between main column spacer and sub-column spacer is reduced, then spacer density uniformity is improved, but light blocking capability decreases
Solution Approach 1:
The patent divides the light blocking function into two separate components: the light blocking member (with varying thickness for adhesion and light blocking) and the spacers (with uniform, smaller step differences for density control). This segmentation allows each component to be optimized independently - the light blocking member handles light blocking with greater thickness variation, while the spacers maintain uniform density with minimal step differences, thereby preventing light leakage through the spacer region.
Data Source
AI summary
A liquid crystal display device includes: a first substrate including a first light blocking region, wherein a plurality of transistors are formed in the first light blocking region; a second substrate facing the first substrate, the second substrate including a common electrode disposed thereon; and a liquid crystal layer interposed between the first substrate and the second substrate, wherein the first substrate includes: a data line disposed extending in a vertical direction; color filters, each of the color filters overlapping adjacent color filters to form a color filter overlapping portion in boundary regions of the color filters in a vertical direction; and a light blocking member disposed extending in a horizontal direction covering the first light blocking region, wherein the data line and the color filter overlapping portion are spaced apart from each other in a horizontal direction in a region where the light blocking member is formed.