Display Substrate Layout Using Signal Lines to Shield Reset TFTs
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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 protection and improving the reliability of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light shielding structures are added to protect reset transistors, then the reliability of TFTs is improved, but the device complexity increases
Solution Approach 1:
The patent combines the light shielding function with existing structural elements in the display device. The reset control line and initialization signal line serve dual purposes: they are both signal transmission pathways and light shielding structures that block external light from reaching the reset transistor. This merging approach provides protection without adding separate shielding components, thus avoiding increased device complexity.
Solution Approach 2:
Existing conductive lines in the display substrate are designed to perform multiple functions. The reset control line and initialization signal line not only transmit control signals but also act as light shielding elements. This multi-functionality allows the system to achieve light protection using already-present structures, avoiding the need for additional dedicated shielding components and thereby maintaining simplicity while improving reliability.
2Reliability
If multiple light shielding structures are used to cover reset transistor, then the protection effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent integrates light shielding into existing conductive lines that are already part of the standard manufacturing process. By making the reset control line and initialization signal line serve as shielding structures, the design avoids adding separate shielding layers or components that would require additional alignment and precision control. This approach maintains manufacturing simplicity while achieving effective light protection.
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.