Black Matrix Cell Gap Maintenance in LCD Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing liquid crystal display (LCD) panel manufacturing process is inefficient due to the need for multiple process steps and masks, which increases manufacturing costs and reduces productivity, particularly in PVA and SPVA mode LCD panels that aim to improve viewing angles.
Innovation Solution
The LCD panel design incorporates first and second black matrices on the opposite substrate to maintain the cell gap and prevent liquid crystal flow, eliminating the need for additional spacers and reducing process steps, while the second black matrix's varying heights impede liquid crystal flow and prevent contamination, thereby simplifying the manufacturing process and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If openings are formed through the common electrode to define domains in PVA and SPVA mode LCD panels, then the viewing angle is improved, but the number of process steps and masks increases
Solution Approach 1:
The patent extracts the domain definition function from the common electrode (which would require openings and masks) and relocates it to the black matrix structure. The black matrix's protrusions and recessions directly define the domains without requiring openings in the common electrode, thereby eliminating the need for additional masks and process steps while maintaining the improved viewing angle characteristics.
Solution Approach 2:
The black matrix is given multiple functions: it continues to serve its traditional light-blocking function while simultaneously serving as the domain-defining structure through its varied height profile. This multi-functionality eliminates the need for separate domain-defining structures or openings in the common electrode, reducing process complexity while maintaining viewing angle improvements.
2Manufacturing precision
If additional spacers are used to maintain cell gap, then the cell gap is maintained, but the manufacturing process becomes more complex
Solution Approach 1:
The black matrix is given the dual function of light blocking and cell gap maintenance. Its protrusions into the liquid crystal layer physically maintain the cell gap without requiring separate spacer materials or additional deposition processes, thereby maintaining manufacturing precision while reducing process complexity.
Solution Approach 2:
The patent merges the cell gap maintenance function with the black matrix structure. Instead of using separate spacers that would require additional process steps, the black matrix itself is designed with height variations that provide the necessary cell gap control, combining multiple functions into a single structure.
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 design reduces manufacturing costs and improves productivity by eliminating the need for additional spacers and thermal processes, while enhancing display quality by maintaining the cell gap and preventing liquid crystal contamination, thus addressing the inefficiencies in existing LCD panel production.
Implementation Method 1
the liquid crystal layer adjusts a transmittance of light according to an intensity of an electric field generated between the array substrate and the opposite substrate
Data Source
AI summary
A display panel includes an opposite substrate and an array substrate, the array substrate includes a first base substrate, a plurality of pixels and a color filter. The opposite substrate includes a second base substrate, a first black matrix and a second black matrix. The first black matrix maintains an interval between the second base substrate and the array substrate, and the first black matrix is formed to correspond to a display area to block light. The second black matrix includes a first area and a second area. The first area surrounds the color filter and the second area surrounds the first area. The second area includes a height different from a height of the first area when viewed in a plan view.