Electroluminescent Display Routing for Larger Active Areas
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Solution Overview
Problem
Electronic devices often have large display bezels that reduce the active area and minimize information content, particularly in wearable devices like smartwatches, due to the space consumed by driving circuitry.
Innovation Solution
Positioning electroluminescent layers away from the grid of transistors by extending routing lines above the driving circuitry, allowing the diodes to be disposed above the circuitry, thereby enlarging the active display area without reducing the space allocated to driving circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driving circuitry is positioned around the perimeter of the pixel array, then the circuitry can be properly connected to transistors, but the display bezel area increases and active display area decreases
Solution Approach 1:
The patent applies dimensionality change by extending routing lines from the transistor grid into the third dimension (vertically above the substrate) and then back down to connect to electroluminescent layers. This allows driving circuitry to be positioned in the planar area beneath the display without increasing the bezel, effectively moving circuitry from a 2D perimeter layout to a 3D distributed layout that preserves active display area.
2Area of stationary object
If electroluminescent layers are positioned close to the transistor grid, then routing distance is minimized, but the active display area is reduced due to required panel border area
Solution Approach 1:
The patent resolves this contradiction by utilizing vertical routing (another dimension) to connect electroluminescent layers to the transistor grid. Routing lines extend upward from transistors, allow electroluminescent layers to be positioned farther from the transistor grid in the planar direction, and then connect back down, minimizing the impact on active display area while controlling routing length through vertical rather than horizontal extension.
Solution Approach 2:
The patent introduces routing lines as intermediary elements that mediate between the transistor grid and electroluminescent layers. These routing lines act as flexible connectors that can extend in multiple directions and dimensions, allowing electroluminescent layers to be positioned optimally for display area while maintaining electrical connection to transistors through the intermediary routing structure.
3Area of stationary object
If panel border area is reduced to enlarge active area, then more display space is available, but driving circuitry cannot be properly accommodated
Solution Approach 1:
The patent enables driving circuitry accommodation without increasing panel border area by moving circuitry elements into the third dimension. Electroluminescent layers and associated routing are positioned above the substrate plane, allowing driving circuitry to coexist with the active display area in a vertically stacked arrangement rather than requiring additional planar border space.
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
Enlarges the active display area by overlaying diodes over driving circuitry, resulting in a narrower bezel and increased information content without reducing the space for circuitry, applicable to various electronic devices including smartwatches and other irregular- or regular-shaped displays.
Implementation Method 1
an electroluminescent layer that is configured to emit light when a voltage is applied across a cathode and an anode
Data Source
AI summary
This document describes systems and techniques directed at enlarging active areas of displays in electronic devices. In aspects, a display includes a grid of transistors positioned within a display panel module to control an illumination of one or more electroluminescent layers. Routing lines extend from one or more transistors of the grid of transistors to at least one electroluminescent layer. In this way, the at least one electroluminescent layer can be positioned away from the grid of transistors and disposed above portions of display panel module driving circuitry. As a result, active areas of displays can be enlarged and information content can be maximized without a panel border area allotted to the display panel module driving circuitry surrounding transistors having to be reduced.