LCD Color Filter Layout With Dual Light Shielding for Oblique Color Mixing
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Solution Overview
Problem
High-definition liquid crystal panels face issues with color mixing in oblique views due to light leakage through adjacent color filters, which reduces color reproducibility and is exacerbated by the difficulty in forming light-shielding members like black matrices.
Innovation Solution
A liquid crystal display device with a color filter on array structure that includes first and second light-shielding members, where the second light-shielding members are wider than the first and extend along a direction intersecting the color filters, preventing color mixing without reducing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the line width of the light-shielding layer is reduced to ensure aperture ratio, then the aperture ratio is improved, but positional misalignment between color filters and pixel electrodes increases
Solution Approach 1:
The light-shielding function is divided into two separate members: a first light-shielding member on the support substrate side and a second light-shielding member on the liquid crystal layer side. This segmentation allows each member to be optimized independently for its specific function while collectively providing the required light-shielding performance.
Solution Approach 2:
The overlapping portion between the first and second light-shielding members acts as an intermediary region that provides enhanced light-shielding coverage. This intermediary structure ensures that light leakage between adjacent color filters is effectively blocked without requiring reduced line width of individual members.
2Object-affected harmful factors
If light-shielding members are formed on the counter substrate, then light leakage is reduced, but processing precision becomes difficult to maintain
Solution Approach 1:
Instead of forming light-shielding members only on the counter substrate (conventional approach), the patent inverts the approach by placing light-shielding members on both substrates. Specifically, the first light-shielding member is disposed on the support substrate side while the second light-shielding member is disposed on the liquid crystal layer side, providing light-shielding from both directions.
Solution Approach 2:
The light-shielding structure is extended from a single-sided approach to a dual-sided approach by adding the first light-shielding member on the support substrate side. This dimensional expansion creates an overlapping region that provides enhanced light-shielding coverage without increasing the complexity of forming members on the counter substrate.
3Measurement precision
If adjacent color filters of different colors are arranged closely, then the definition is improved, but color mixing in oblique view increases
Solution Approach 1:
The overlapping portion of the light-shielding members is positioned in advance to cover the region where adjacent color filters overlap. This preliminary positioning ensures that light-shielding coverage is established before light can leak between the color filters, preventing color mixing in oblique views while maintaining close spacing for high definition.
Data Source
AI summary
The liquid crystal display device includes a first substrate sequentially including a support substrate, a conductive line layer, a color filter layer, a first electrode, an insulating layer, and a second electrode. The color filter layer includes color filters. Adjacent two color filters have different colors and have an overlapping portion. The first substrate includes a first light-shielding member and a second light-shielding member. The first light-shielding member overlaps the overlapping portion, and the second light-shielding member overlaps the overlapping portion and the first light-shielding member. The width of the second light-shielding member is greater than the width of the first light-shielding member. The width of one type of color filter having one of a plurality of colors is greater than the sum of the width of a space between adjacent second light-shielding members, the width of the first light-shielding member, and the width of the second light-shielding member.