Bent Display Panel TFT Channel Layout for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display panels based on low temperature polycrystalline silicon (LTPS) exhibit a brightness difference between bent and non-bent areas due to strain-induced changes in carrier mobility and turn-on current, leading to uneven display quality over time.
Innovation Solution
The display panel design incorporates thin film transistors with conductive channels oriented at specific angles relative to the bending shaft, minimizing strain and maintaining consistent carrier mobility and drive current across bent and non-bent areas, thereby reducing brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive channel is oriented parallel to the strain direction (0 degrees to bending shaft), then carrier mobility increases under compressive strain, but brightness difference between bent and non-bent areas increases
Solution Approach 1:
The patent applies asymmetry by setting the conductive channel direction at a specific angle (0 degrees to 5 degrees relative to bending shaft) rather than symmetrically parallel or perpendicular to the bending direction. This asymmetric orientation optimizes the balance between strain utilization and brightness uniformity, allowing the channel to experience controlled compressive strain while minimizing brightness differences between bent and non-bent areas.
Solution Approach 2:
The patent changes the orientation parameter of the conductive channel from conventional parallel alignment to a specific angled configuration (0-5 degrees to bending shaft). This parameter change transforms how strain affects carrier mobility, converting harmful strain-induced brightness variations into controlled mobility enhancement while maintaining display uniformity.
2Illumination intensity
If the conductive channel direction is optimized for strain reduction (less than 90 degrees to bending shaft), then brightness uniformity improves, but manufacturing complexity increases due to precise angle requirements
Solution Approach 1:
The patent applies preliminary action by pre-defining the conductive channel orientation angle (0-5 degrees to bending shaft) during the design and manufacturing planning stage. This predetermined angular specification allows manufacturing equipment to be pre-configured with the correct alignment parameters, reducing the need for complex real-time adjustments and simplifying the fabrication process.
Solution Approach 2:
The patent applies local quality by specifying different orientation requirements for different regions: the conductive channel in the bent display area is oriented at 0-5 degrees to the bending shaft, while other components can maintain conventional orientations. This localized optimization allows precise angle control only where strain effects are critical, reducing overall 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 approach enhances display uniformity by reducing strain on conductive channels, maintaining consistent carrier mobility and drive current, and minimizing brightness differences between bent and non-bent areas, improving overall display performance.
Implementation Method 1
when bending of the display panel causes the first thin film transistor to be subjected to a compressive strain
Data Source
AI summary
Embodiments of this application provide a display panel, a display panel manufacturing method, and an electronic device. The display panel includes a bent display area, the bent display area has a bending shaft, a plurality of first thin film transistors are disposed in the bent display area, each first thin film transistor includes a first source and a first drain, a first conductive channel is formed between the first source and the first drain of each first thin film transistor, and an included angle between a direction of the first conductive channel and the bending shaft is less than 90 degrees; and a total length of each part of the first conductive channel in the direction of the first conductive channel is greater than a total length of each part of the first conductive channel in any other direction. The display panel can reduce a difference between display brightness of the bent display area and display brightness of a non-bent display area.