AMOLED Power Mesh Layout Around Display Holes to Reduce Crosstalk
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Solution Overview
Problem
Display panels with windows, such as those used for cameras or buttons, experience non-uniform voltage drops in the power supply mesh, leading to image distortions due to the interruption of column traces, which can result in undesirable luminance variations and pixel cross-talk issues.
Innovation Solution
Disconnecting a subset of column traces from the voltage supply bus and routing electrical energy through interconnections with row traces to maintain uniform voltage across the active area, thereby avoiding non-uniform luminance and reducing pixel cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If column traces are continuously connected from the voltage supply bus across the entire active area, then electrical energy can be directly supplied to all pixel circuits, but non-uniform voltage drops occur in regions near windows causing image distortions
Solution Approach 1:
The patent segments the column traces into two distinct groups: continuously connected column traces that extend from the voltage supply bus to the far end of the active area, and discontinuously connected column traces that are interrupted at window boundaries. This segmentation allows different trace configurations in different regions, enabling uniform voltage distribution while accommodating window structures without requiring complex routing throughout the entire display.
Solution Approach 2:
The patent applies different trace connection strategies to different spatial regions: continuously connected traces are used in regions where uniform voltage supply is critical, while discontinuously connected traces are used in regions adjacent to windows where direct connection would cause voltage drops. This local differentiation optimizes voltage uniformity in each specific region rather than applying a uniform approach across the entire display.
2Reliability
If column traces are disconnected at window boundaries to avoid non-uniform voltage drops, then voltage uniformity improves, but the power supply path becomes longer and more complex
Solution Approach 1:
The patent maintains continuous voltage supply action by ensuring that even discontinuously connected column traces receive power through continuous paths via row traces and interconnections. The useful action of power delivery continues uninterrupted despite the physical discontinuity of column traces at window boundaries, as electricity flows through alternative paths (row traces → interconnections → subsequent column traces) to reach all pixel circuits.
3Use of energy by moving object
If all column traces are directly connected to the voltage supply bus, then the power supply path is short and efficient, but regions near windows experience non-uniform voltage drops causing pixel cross-talk
Solution Approach 1:
The patent introduces row traces and interconnections as intermediary elements that mediate the power supply path for discontinuously connected column traces. Instead of directly connecting all column traces to the voltage supply bus (which causes cross-talk), the system uses row traces and interconnections as intermediate components to route power through alternative paths, eliminating the harmful voltage drops and pixel cross-talk while maintaining power supply efficiency.
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 configuration ensures uniform voltage distribution and reduces pixel cross-talk, enhancing image quality by minimizing luminance variations and simplifying compensation algorithms, thus improving the overall display performance.
Implementation Method 1
a voltage supply grid configured to transport an electrical signal from the voltage supply bus to the plurality of pixel circuits, the voltage supply grid comprising a plurality of column traces and a plurality of row traces
Data Source
AI summary
Techniques to provide uniform luminance across a computing device display, such as an active matrix organic light emitting diode (AMOLED) display. In some examples, a computing device display may include a hole within the active area of the display that may be used for a camera, a button or some other function. The hole may result in a non-uniform voltage drop in a power supply mesh in regions of the active area near the hole. The power supply mesh may provide electrical energy to elements of the display. The techniques of this disclosure include portions of the power supply mesh that are not connected to the voltage supply bus to ensure a uniform voltage drop across the active area of the display.