Display Substrate Electrode Patterning for TFT Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for manufacturing display substrates face challenges in maintaining the reliability and electrical characteristics of thin film transistors due to exposure of active patterns and metal layers to gases and solutions during processing, leading to potential deterioration and reduced performance.
Innovation Solution
The method involves forming a display substrate with a base substrate having distinct cell areas and intervening areas, where the electrode patterns are carefully patterned and etched to prevent exposure of the base substrate in intervening areas, thereby minimizing contact with gases and solutions and ensuring the integrity of source and drain electrodes, and using photoresist patterns to control etching processes for forming active patterns and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electrode layer is removed in the intervening area to improve light transmittance, then the light transmittance of the display device is improved, but the reliability and electrical characteristics of thin film transistors deteriorate due to exposure to gases and solutions
Solution Approach 1:
The patent applies local quality by differentiating the treatment between cell areas and intervening areas. In cell areas, the electrode layer is completely removed to maximize light transmittance, while in intervening areas, the electrode layer is preserved to protect underlying metal layers from deterioration. This localized differentiation allows simultaneous optimization of optical performance and device reliability.
Solution Approach 2:
The substrate is segmented into distinct regions (cell areas and intervening areas) with different functional requirements. The patterning process creates discrete zones where the electrode layer is selectively removed or retained, enabling independent optimization of each region's properties for light transmittance and transistor protection respectively.
2Illumination intensity
If the electrode layer is completely removed in intervening areas to maximize light transmittance, then light transmittance is improved, but metal layers become exposed to gases and solutions causing deterioration
Solution Approach 1:
The patent implements local quality by applying different electrode layer removal strategies to different spatial zones. Cell areas experience complete electrode layer removal for maximum light transmission, while intervening areas maintain the electrode layer as a protective barrier against harmful gases and solutions, preventing metal layer deterioration.
Solution Approach 2:
The electrode layer in intervening areas serves as an intermediary protective barrier between the external environment (gases and solutions) and the underlying metal layers. This intermediate layer prevents direct contact between harmful external factors and sensitive metal structures, thereby preventing deterioration while allowing light transmission.
3Manufacturing precision
If photoresist patterns are used to control etching processes, then manufacturing precision is improved, but process complexity increases
Solution Approach 1:
The patent applies preliminary action by forming photoresist patterns before the etching process. These pre-formed patterns serve as precise masks that define the boundaries between cell areas and intervening areas, ensuring accurate electrode layer removal only in designated regions while protecting other areas, thereby achieving high patterning precision.
Solution Approach 2:
Photoresist patterns act as intermediary masking layers during the etching process. These temporary structures enable precise control over where the electrode layer is removed by serving as protective barriers during etching, allowing complex patterning to be achieved through controlled intermediate steps.
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 approach enhances the reliability and electrical characteristics of thin film transistors by preventing deterioration of metal layers and improving the manufacturing process, resulting in improved display substrate performance and reduced defects.
Implementation Method 1
A first photoresist pattern may be formed on the semiconductor layer in the display regions of the first and the second cell areas
Implementation Method 2
The first insulation layer and the semiconductor layer may be partially etched by a first etching process using the first, the second and the third photoresist patterns as etching masks
Data Source
AI summary
A method of manufacturing a display substrate is disclosed. In one embodiment, an electrode layer may be formed on a base substrate including a first cell area, a second cell area and an intervening area between the first and the second cell areas. First electrodes may be formed in display regions of the first and the second cell areas by patterning the electrode layer. The electrode layer in an intervening area may be removed. Source electrodes and drain electrodes of thin film transistor may be formed in the first and the second cell areas where the first electrodes are formed.