Optoelectronic Semiconductor Components Switch-On Delay Compensation

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Solution Overview

Problem

Visual display apparatuses face challenges in displaying multicolor image content due to significant differences in intrinsic switch-on delays of semiconductor components, leading to issues like shifted color impressions and inadequate emission of blue and green components, especially during dark content and high refresh rates.

Innovation Solution

The method involves adjusting the lateral dimensions of optoelectronic semiconductor components and using delay clock signals to reduce or compensate for intrinsic switch-on delays, ensuring synchronized turn-on times and improved color representation by maintaining a ratio of parasitic capacitance to operating current for equal switch-on delays across components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If different optoelectronic semiconductor components with different material systems are used to emit different wavelengths, then color display capability is improved, but intrinsic switch-on delays differ significantly causing shifted color impressions and inadequate emission

Engineering Contradiction:

Improvecolor display capabilityVSAvoidswitch-on delay difference

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by adjusting the lateral dimensions of semiconductor components before operation to pre-compensate for intrinsic switch-on delay differences. By modifying the active layer area during manufacturing, the parasitic capacitance is adjusted so that components with originally longer switch-on delays have larger areas, and vice versa, achieving synchronized turn-on times across different wavelength components

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes physical parameters of the semiconductor components, specifically the lateral dimensions (area of active layer) and parasitic capacitance values. By adjusting these parameters according to the formula C ∝ A (capacitance proportional to area), the switch-on delays are equalized while maintaining the different material systems needed for various wavelengths

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the lateral area of optoelectronic semiconductor components is increased to improve emission intensity, then brightness is improved, but parasitic capacitance increases causing longer switch-on delays

Engineering Contradiction:

Improveemission intensityVSAvoidswitch-on delay

Core Design Contradiction:

Illumination intensityVSLoss of time

Solution Approach 1:

The patent applies local quality by giving different lateral dimensions to different semiconductor components based on their specific requirements. Each component's area is individually optimized: components needing higher emission intensity have larger areas, while components with inherently longer switch-on delays have even larger areas to compensate, creating a non-uniform but optimally balanced configuration across the display

Inventive Principle:

Principle #3Local quality

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 enables nearly simultaneous emission of different wavelengths, enhancing color dynamics and brightness, and ensuring accurate color representation within the DCI-P3 color space with minimal deviation, even during dark content and high refresh rates.

Implementation Method 1

an optoelectronic semiconductor component arranged to emit a wavelength... an active region for generating electromagnetic radiation... during the rise time, the first injection of charge carriers into the quantum wells of the active layer takes place and thus the emission of electromagnetic radiation begins

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

The intrinsic switch-on delay depends inter alia on the size of the parasitic capacitance... During the dead time, only the parasitic capacitance of the semiconductor component is charged

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11568779B2Method and display device for reducing switch-on delay between different light emission components

Publication Date: 2023.01.31 OSRAM OPTO SEMICON GMBH & CO OHG

AI summary

A method for operating a visual display apparatus is specified. The apparatus comprises a first optoelectronic semiconductor component configured to emit electromagnetic radiation of a first wavelength and comprising a first intrinsic switch-on delay. The apparatus comprises a second optoelectronic semiconductor component configured to emit electromagnetic radiation of a second wavelength and comprising a second intrinsic switch-on delay. The second wavelength is different from the first wavelength. The first semiconductor component is operated with a first operating current according to a first actuation signal. The second semiconductor component is operated with a second operating current according to a second actuation signal. The first and/or the second actuation signal comprise a delay clock signal selected such that emissions of electromagnetic radiation from the first and second semiconductor components comprise a switch-on delay with respect to each other that is smaller than a difference of the first and second intrinsic switch-on delays.