Narrowed Power Lines for Transparent Sensor Bezels
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Solution Overview
Problem
In conventional active matrix organic light emitting diode (AMOLED) display panels, metal power lines on the bezel attenuate radiation detected by front-facing sensors, necessitating a wider bezel to accommodate both power lines and sensors, which increases the bezel width.
Innovation Solution
The power lines are narrowed or gaps are created in the bezel area where sensors are located, making the bezel transparent to electromagnetic radiation, allowing sensors to be positioned closer to the display active area and reducing the bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power lines are maintained with uniform width across the entire bezel, then electrical power supply reliability is improved, but sensor detection precision deteriorates due to radiation attenuation
Solution Approach 1:
The power line width is varied locally: wider sections are used in regions where sensors are not present to ensure reliable power supply, while narrower sections or gaps are created in regions where sensors are located to minimize radiation attenuation. This local differentiation allows both power supply reliability and sensor detection precision to be optimized in their respective zones.
Solution Approach 2:
The power line is segmented into multiple sections with different widths along its path through the bezel. The power line consists of a first section with a first width and a second section with a second width that is narrower than the first width, allowing the line to be divided into functional zones that serve different purposes.
2Measurement precision
If front-facing sensors are positioned laterally offset from power lines, then sensor detection precision is improved by reducing radiation attenuation, but bezel width increases to accommodate both components
Solution Approach 1:
Instead of laterally offsetting the sensor from the power line (which would increase bezel width), the power line itself is modified locally by reducing its width or creating gaps at the sensor location. This allows the sensor to remain in its optimal position while minimizing radiation attenuation from the power line.
3Length of stationary object
If power line width is reduced or gaps are created at sensor location, then bezel width is reduced allowing sensors closer to display area, but power supply capability may deteriorate
Solution Approach 1:
The power line width is reduced only locally at the sensor location rather than uniformly across the entire bezel. The majority of the power line maintains its original width to ensure adequate power supply capability, while only the section passing through or near the sensor is narrowed or gapped to minimize radiation attenuation.
Solution Approach 2:
The power line is segmented into sections with different widths, where only the section intersecting the sensor region is narrowed. This segmentation allows the power line to maintain sufficient cross-sectional area for power delivery in most regions while creating a narrow section that minimizes interference with the sensor.
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 reduces the bezel width at the edge of the display panel, enabling more compact designs in devices like smartphones and tablets by minimizing the interference of power lines with sensor operations.
Implementation Method 1
metal layers that form the power lines can attenuate radiation detected by the sensors
Implementation Method 2
the portion of the bezel at the second edge being substantially transparent to the one or more wavelengths of electromagnetic radiation
Data Source
AI summary
A display panel includes: a display active area having multiple pixels; a bezel surrounding the display active area; a connector tab attached to the bezel at a first edge of the bezel; and a power line(s) formed from an opaque material, the power line(s) extending from the connector tab to a second edge of the bezel opposite the first edge, the power line(s) being configured to supply electrical power to the display active area, the power line(s) having a first width in a plane of the display along a side edge of the bezel between the first and second edges and, at a portion of the bezel at the second edge, a second width narrower than the first width or a gap in the power lines, the portion of the bezel at the second edge being substantially transparent.