Black Matrix Structure for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display technology, the increased line width of black matrices can lead to the phenomenon of 'black lines' being visible to viewers, especially at low pixel density, which affects the display's brightness and color accuracy.
Innovation Solution
A black matrix structure is introduced, featuring a first black matrix with predefined opening regions and a second black matrix within these openings, where the edges of the second black matrix are adjacent to or in contact with the first black matrix, reducing the combined width and area of the shading pattern, thereby minimizing the visibility of 'black lines'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the line width of the black matrix is increased to reduce opening areas in subpixels R and B, then the maximal brightness of subpixels R and B is reduced to match subpixel G, but the line width becomes too large causing viewers to see 'black lines'
Solution Approach 1:
The black matrix is divided into two parts: a first black matrix forming the outer boundary and a second black matrix forming an inner shading pattern within the opening region. This segmentation allows the outer black matrix to maintain appropriate width for structural integrity while the inner shading pattern provides additional light blocking functionality, achieving the required brightness balance without increasing the visible black line width.
Solution Approach 2:
The shading pattern of the second black matrix is designed to extend in the vertical direction (from the light incident surface toward the liquid crystal layer) rather than increasing the horizontal line width. This dimensional change allows the black matrix to block more light effectively without increasing the lateral dimension that would be visible as black lines to viewers.
2Stability of the object's composition
If the opening area of pixels is reduced to balance brightness across subpixels, then color cast is avoided, but the display brightness and color accuracy are compromised
Solution Approach 1:
The opening region is functionally segmented into two parts: the outer boundary defined by the first black matrix and the inner shading pattern defined by the second black matrix. This allows independent optimization of each part - the outer boundary maintains sufficient opening area for brightness while the inner shading pattern provides precise light control to balance brightness across different subpixels with different color saturation requirements.
Solution Approach 2:
The second black matrix provides localized light blocking within specific opening regions where needed. By placing shading patterns only in predetermined opening regions of subpixels R and B (which have lower color saturation), the solution achieves local brightness balancing without globally reducing the opening areas of all pixels, thereby maintaining overall display brightness and color accuracy.
Data Source
AI summary
A black matrix structure and manufacturing method thereof, an array substrate, a color filter substrate and a display apparatus are provided. The black matrix structure comprises a first black matrix and a plurality of predefined opening regions arranged in an array and surrounded by lines of the first black matrix, wherein, each of the predefined opening regions is provided with an opening therein, and at least one of the predefined opening regions is provided with a second black matrix therein, edges of shading pattern of the second black matrix are adjacent to the opening or in contact with at least one line edge of the first black matrix, and length of a part of each line edge of the first black matrix being in contact with the edge of shading pattern of the second black matrix is less than length of this line edge of the first black matrix.