Display Panel Driving Area Asymmetry for Mura Defect Prevention
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Solution Overview
Problem
Conventional display panel fabrication methods often result in mura defects due to inconsistent laser beam energy and relative positioning of driving areas, leading to undesirable defects in pixel areas, especially when the laser beam moves in a stepping manner and varies in energy across different periods.
Innovation Solution
The implementation of a display system with interlaced gate and source lines, where the relative positions of driving areas within pixel areas differ, allowing for controlled laser beam irradiation to prevent mura defects by varying the positions of thin film transistor channels and adjusting the energy exposure of driving elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the laser beam moves by stepping to irradiate all driving areas in the display panel, then the entire display panel can be processed, but the energy of the laser beam in different periods becomes different causing quality inconsistency
Solution Approach 1:
The patent applies asymmetry by intentionally designing different relative positions of driving areas within pixel areas along the laser beam movement direction. Specifically, driving areas in different pixel areas are offset from each other along the scanning direction, so that when the laser beam steps between periods, different portions of the driving areas receive irradiation. This asymmetric arrangement compensates for the energy variation across periods by ensuring that no single driving area consistently receives the worst energy conditions, thereby improving quality consistency across the entire display panel.
2Productivity
If the laser beam irradiates driving areas in different periods with different energy, then all driving areas can be formed, but mura defects occur due to quality differences between periods
Solution Approach 1:
The patent applies local quality by creating intentional variations in the local positions of driving areas within different pixel areas. Instead of having all driving areas at identical relative positions, the patent offsets their positions along the laser scanning direction. This local positional variation ensures that driving areas in different pixel areas experience different laser energy conditions during multi-period irradiation, preventing systematic quality defects (mura) that would otherwise occur across entire columns or rows of pixel areas.
3Ease of manufacture
If the relative positions of driving areas in pixel areas are the same, then the manufacturing process is simple, but cyclically occurring mura defects are generated
Solution Approach 1:
The patent breaks the symmetric arrangement of driving areas by introducing asymmetric offsets along the laser scanning direction. While this increases manufacturing complexity slightly, it effectively eliminates the cyclic mura defects that arise from uniform positioning. The asymmetric design ensures that no repetitive pattern of defects can form across pixel areas, as each pixel area's driving area experiences a unique local position relative to the moving laser beam.
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 effectively prevents mura defects by ensuring consistent quality of driving areas across the display panel, even when laser beam energy varies, by adjusting the relative positions of driving elements and channels within the thin film transistors, thereby maintaining image quality.
Implementation Method 1
When a laser beam 10 irradiates the driving areas D11 to D35, driving elements are formed in the driving areas D11 to D35
Data Source
AI summary
Systems for displaying images are provided. A representative system comprises a display panel. The display panel comprises first, second and third signal lines, and first and second pixel areas. The first and second signal lines are extended straight along a first direction. The third signal line is extended straight along a second direction and interlaced with the first and second signal lines. The first pixel area is coupled to the first signal line, and the second pixel area is coupled to the second signal line and the first signal line and has a second driving area. A relative position of a first driving area in the first pixel area is different from that of a second driving area in the second pixel area and the first and second pixels display the same color.