Array Substrate Pixel Electrode Shielding for Light-Induced TFT Leakage
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Solution Overview
Problem
The existing array substrates in electronic paper displays suffer from leakage currents due to external light irradiation on the conductive channels of thin film transistors, which reduces contrast and requires additional light-shielding layers that complicate manufacturing and increase costs.
Innovation Solution
The array substrate design incorporates spaced first and second pixel electrodes on the same layer, connected to different signal lines, with the first pixel electrode positioned over the conductive channel to shield it from external light, and a control method adjusts driving strategies based on light intensity to prevent leakage currents without additional light-shielding structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional light-shielding layers are added to the array substrate to shield the conductive channel from external light, then leakage current is reduced and display contrast is improved, but the manufacturing process becomes more complex and costs increase
Solution Approach 1:
The pixel electrode structure is designed to perform dual functions: driving the electrophoretic display and simultaneously shielding the conductive channel from external light. By making the pixel electrode extend over the TFT area, it blocks light without requiring separate light-shielding layers, thus resolving the contradiction between display quality and manufacturing complexity
Solution Approach 2:
The light-shielding function is merged with the pixel electrode structure rather than being implemented as a separate component. The pixel electrode is extended to cover both the display area and the underlying conductive channel, combining two functions into one structure and eliminating the need for additional light-shielding layers
2Reliability
If additional light-shielding layers are added to the array substrate to shield the conductive channel from external light, then leakage current is reduced and display contrast is improved, but manufacturing costs increase
Solution Approach 1:
The pixel electrode structure is designed to perform dual functions: driving the electrophoretic display and simultaneously shielding the conductive channel from external light. By making the pixel electrode extend over the TFT area, it blocks light without requiring separate light-shielding layers, thus resolving the contradiction between display quality and manufacturing complexity
3Object-generated harmful factors
If the pixel electrode is extended to cover the conductive channel area, then light shielding is achieved and leakage current is reduced, but the device structure becomes more complex
Solution Approach 1:
The pixel electrode structure is designed to perform dual functions: driving the electrophoretic display and simultaneously shielding the conductive channel from external light. By making the pixel electrode extend over the TFT area, it blocks light without requiring separate light-shielding layers, thus resolving the contradiction between display quality and manufacturing 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 design effectively shields the conductive channels from external light, preventing leakage currents and simplifying the manufacturing process while reducing costs, thereby enhancing display performance and efficiency.
Implementation Method 1
the first pixel electrode corresponds to the conductive channel and is connected to a signal line... effectively shields the conductive channels from external light, preventing leakage currents
Implementation Method 2
displays the bright state mainly through white pigment particles with a great reflective ability in the electronic ink layer
Implementation Method 3
displays the dark state to display the image through the black particles with a good absorption ability in the electronic ink layer
Data Source
AI summary
Disclosed are an array substrate, a control method thereof, a manufacturing method thereof and an electronic paper display device. The array substrate includes a substrate and a plurality of thin film transistors provided on the substrate and a plurality of pixel electrode structures, each thin film transistor includes an active layer, a source and a drain, a conductive channel is provided between the source and the drain and is provided on the active layer, a plurality of pixel electrode structures each is provided on a side of each thin film transistor away from the substrate, each pixel electrode structure includes a first pixel electrode and a second pixel electrode spaced from each other, the first pixel electrode corresponds to the conductive channel and connected to a voltage line, and the second pixel electrode is connected to the drain through a conductive through hole.