TFT Substrate Black Matrix Placement for Curved Display Masking
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Solution Overview
Problem
In curved liquid crystal display panels, displacement between the TFT substrate and the color filter substrate leads to light leakage due to inadequate masking by the black matrix, resulting in reduced contrast and user experience.
Innovation Solution
The manufacturing method involves forming black matrices on the active layer and capacitance electrodes on the scanning lines, ensuring the black matrices are on the same layer as the source and drain electrodes, and using black resin material to maintain the masking effect even when the panel is curved, while reducing coupling capacitance between data and scanning lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the black matrix is arranged on the color filter substrate, then the masking effect is provided, but light leakage occurs when the panel is curved due to displacement between substrates
Solution Approach 1:
The patent moves the black matrix from the color filter substrate to the TFT substrate, changing its spatial position to a different layer. This dimensional relocation ensures the black matrix remains on the TFT substrate regardless of curvature-induced displacement, effectively preventing light leakage while maintaining the masking effect.
Solution Approach 2:
The black matrix is formed on the TFT substrate before panel assembly, establishing the masking structure in advance. This preliminary positioning ensures the black matrix is already correctly placed on the TFT substrate, preventing subsequent light leakage issues when the panel is curved.
2Object-affected harmful factors
If the black matrix is made by black resin material, then the masking effect is enhanced, but the material may degrade during manufacturing
Solution Approach 1:
The patent changes the formation parameters of the black matrix by applying it to the TFT substrate at a lower temperature stage, before the active layer is formed. This parameter change (lower temperature, earlier stage) prevents degradation of the black resin material while still achieving effective light leakage prevention.
Solution Approach 2:
The black matrix is formed preliminarily on the TFT substrate before subsequent high-temperature processing steps. This preliminary formation protects the black resin material from degradation by establishing it earlier in the manufacturing sequence, when temperature conditions are more favorable.
3Reliability
If the active layer covers the scanning line, then the electrical connection is improved, but the coupling capacitance between data line and scanning line increases
Solution Approach 1:
The patent applies local quality by having the active layer selectively cover only the gate electrode while leaving the scanning line exposed. This localized differentiation maintains necessary electrical connections at the gate electrode interface while preventing increased coupling capacitance between the data line and scanning line.
Solution Approach 2:
The patent segments the coverage function by dividing the active layer's position into two zones: covering the gate electrode for electrical connection, and not covering the scanning line to minimize capacitance. This segmentation allows simultaneous optimization of both electrical connection and capacitance reduction.
Data Source
AI summary
A TFT substrate and the manufacturing method thereof are disclosed. The method includes: providing a substrate; forming a gate electrode on the substrate; forming a first insulation layer and an active layer on the gate electrode in turn; forming a first black matrix on the active layer; forming a source electrode and a drain electrode on the first black matrix; forming a second insulation layer on the source electrode and the drain electrode; and forming a pixel electrode on the second insulation layer. The pixel electrode is electrically connected to the source electrode or the drain electrode via the second insulation layer. In this way, the masking effect of the display panel assembled by the TFT substrate can be ensured. In addition, the coupling capacitance between the data line and the scanning line may be reduced.