Display Substrate Power-Line and Anode Shielding for TFT Stability
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Solution Overview
Problem
Thin film transistors (TFTs) in display substrates are sensitive to light, which can affect their performance and reliability.
Innovation Solution
The display substrate incorporates light shielding structures, including power signal lines and anodes of light-emitting elements, to shield reset transistors from external light, enhancing their reliability by blocking direct irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light shielding structures are added to protect TFTs from light, then reliability of TFTs is improved, but device complexity increases
Solution Approach 1:
The patent makes existing structural elements serve dual purposes: power signal lines and anodes are configured not only for their primary electrical functions but also as light shielding structures. The anode extends in specific directions to cover reset transistors, and power signal lines are positioned to shield transistor active layers, allowing these components to simultaneously perform electrical conduction and optical shielding without adding separate dedicated shielding structures.
Solution Approach 2:
The patent combines the light shielding function with existing electrical conductive structures. Instead of adding separate light shielding layers, the design merges the shielding function into the power signal lines and anode structures that already exist in the display device architecture, thereby integrating multiple functions into unified structural elements.
2Stability of the object's composition
If light shielding structures are added to protect TFTs from light, then stability of display panel is improved, but manufacturing complexity increases
Solution Approach 1:
The existing anode and power signal line structures are designed to fulfill both their original electrical functions and additional light shielding functions. The anode is extended in specific directions to cover reset transistors, and power signal lines are positioned to shield transistor active layers, allowing these components to simultaneously perform electrical conduction and optical shielding without adding separate dedicated shielding structures.
Solution Approach 2:
The patent combines the light shielding function with existing electrical conductive structures. Instead of adding separate light shielding layers, the design merges the shielding function into the power signal lines and anode structures that already exist in the display device architecture, thereby integrating multiple functions into unified structural elements.
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
The light shielding structures effectively reduce the impact of external light on TFTs, improving the reliability and stability of the display panel.
Implementation Method 1
the first reset transistor is at least partially covered by a first light shielding structure in a direction away from the base substrate, the first light shielding structure comprises the power signal line; and the first reset transistor is at least partially covered by a second light shielding structure in a direction away from the base substrate, the second light shielding structure comprises an anode of the light-emitting layer or a metal line of the touch control layer
Data Source
AI summary
A display substrate includes a base substrate and a drive circuit layer, a light-emitting layer, and a touch control layer arranged on the base substrate. The first reset transistor is at least partially covered by a first light shielding structure in a direction away from the base substrate. The first light shielding structure includes a power signal line. And the first reset transistor is at least partially covered by a second light shielding structure in a direction away from the base substrate. The second light shielding structure includes an anode of the light-emitting layer or a metal line of the touch control layer.