Conductive Black Matrix for Display Array Substrates
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Solution Overview
Problem
The existing COA array substrates have a large parasitic capacitance due to the black matrix being between the data line and the common electrode, leading to increased power consumption.
Innovation Solution
The black matrix is electrically connected with the common electrode, either by being located on or below it, ensuring they have the same potential, thereby reducing parasitic capacitance and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black matrix is positioned between the data line and the common electrode, then light absorption and contrast are improved, but parasitic capacitance increases leading to higher power consumption
Solution Approach 1:
The black matrix is electrically connected to the common electrode through direct contact or via a conductive layer, ensuring they are at the same potential. This eliminates the potential difference between the black matrix and common electrode, thereby reducing parasitic capacitance and associated power consumption while maintaining the black matrix's light absorption function
2Ease of manufacture
If the black matrix is electrically isolated from the common electrode, then manufacturing simplicity is maintained, but parasitic capacitance increases
Solution Approach 1:
The black matrix and common electrode are merged electrically through direct contact or a conductive connecting layer. This integration eliminates the need for additional insulation structures while reducing parasitic capacitance, as the black matrix becomes part of the common electrode's electrical domain
3Loss of energy
If the black matrix is made highly conductive, then parasitic capacitance is reduced, but manufacturing complexity increases due to material selection
Solution Approach 1:
The conductive layer used to connect the black matrix to the common electrode serves multiple functions: it provides electrical connectivity to reduce parasitic capacitance, maintains the black matrix pattern for light absorption, and can be integrated with existing ITO or other conductive layers already present in the display structure, avoiding additional material complexity
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 decreases parasitic capacitance and power consumption by eliminating parasitic capacitors between the black matrix and the common electrode, while enhancing the conductive properties and light absorption of the black matrix.
Implementation Method 1
the black matrix includes a conductive sub-layer, and the conductive sub-layer is provided with a pattern of the black matrix. the conductive sub-layer is in contact with the common electrode
Implementation Method 2
the black matrix further includes a light absorbing sub-layer stacked on the conductive sub-layer, the light absorbing layer is provided with the pattern of the black matrix
Data Source
AI summary
An array substrate and a manufacturing method thereof and a display device are disclosed. The array substrate includes a base substrate, and a color filter layer, a common electrode and a black matrix disposed on the base substrate, the black matrix is capable of conducting electricity, and the black matrix is electrically connected with the common electrode. The array substrate can reduce parasitic capacitance, and decrease power consumption.