3D Silicon on Glass OLED Display with Deep Trench Isolation
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face issues with lifetime degradation at increasing current densities and are unable to support high frame rates and transparent, flexible form factors while consuming excessive power.
Innovation Solution
The OLED display incorporates a stack of organic light emitting diodes with deep trench high aspect ratio structures, thin transparent silicon strata for addressing transistors, and a hemispherical microlens array for improved light extraction, along with optimized transistor designs and power management through pulse width modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel area is scaled down to increase pixel areal density, then areal density is improved, but lifetime degradation increases due to increasing current densities
Solution Approach 1:
The patent applies local quality by creating deep trench isolation structures around each OLED pixel, confining the current density to specific regions. This localized current confinement prevents excessive current density spread that would otherwise cause lifetime degradation, while maintaining high pixel areal density through efficient space utilization.
Solution Approach 2:
The patent transitions from a two-dimensional pixel layout to a three-dimensional structure by etching deep trenches (aspect ratio > 1:1) into the substrate. This vertical dimension allows for better current density management and heat dissipation, resolving the contradiction between high areal density and OLED lifetime by adding a depth component to the pixel structure.
2Use of energy by moving object
If power consumption is reduced, then energy efficiency is improved, but the ability to support high frame rates (120 fps) deteriorates
Solution Approach 1:
The patent employs periodic action through pulse width modulation (PWM) driving schemes, where OLED pixels are activated in discrete time slots corresponding to different frame rates (60 fps, 120 fps, 240 fps). This periodic activation allows the display to achieve high frame rates while maintaining low average power consumption by keeping pixels off during non-active periods.
Solution Approach 2:
The patent implements dynamic power management by adjusting the driving current and activation timing of OLED pixels based on the required frame rate. The system can dynamically switch between different frame rate modes (60, 120, 240 fps) and adjust pixel brightness and activation patterns accordingly, optimizing the balance between power consumption and frame rate performance.
3Adaptability or versatility
If a transparent and flexible form factor is implemented, then form factor versatility is improved, but the ability to support high frame rates and maintain performance deteriorates
Solution Approach 1:
The patent uses thin-film transistor (TFT) technology and flexible substrate materials to create bendable OLED displays with various form factors. The deep trench isolation structures and flexible electrode designs maintain electrical performance and frame rate capability (60, 120, 240 fps) even when the display is bent or folded, resolving the contradiction between form factor flexibility and high frame rate performance.
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 enhances the OLED's ability to maintain performance at high frame rates, reduces power consumption, and supports a transparent, flexible form factor, addressing the limitations of previous OLED technologies.
Implementation Method 1
The organic light emitting diode emits light in response to bias voltages existing on the first and second strata
Implementation Method 2
A final hemispherical microlens array layer is deposited on the glass layer
Data Source
AI summary
An organic light emitting display includes an organic light emitting diode that further includes an anode metal connected to a transparent cathode. An organic diode stack further comprising: electron-transport layer, hole transport layer and the emission layer organized into deep trench high aspect ratio structures in a bottom plane of the organic light emitting display and sandwiched between and the anode and cathode layers described above. A first stratum of thin transparent silicon that is attached to a diode plane in the organic light emitting display through a high aspect ratio via. A second stratum of thin transparent silicon that is attached to the first stratum and forming addressing transistors for the devices on the first strata. The organic light emitting diode emits light in response to bias voltages existing on the first and second strata that is extracted through a sub-pixel pitch microlens film deposited on the glass substrate.