Optical Window with Zoned Transmittance for OLED Contrast
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Solution Overview
Problem
Current organic light emitting devices face reduced contrast due to ambient light reflection from high reflective structures, which is not effectively mitigated by existing solutions that either partially reduce ambient light or compromise light emitting efficiency.
Innovation Solution
A light emitting device with an optical window having at least two zones of different transmittance, where one zone is configured to have a lower transmittance than the other, to manage ambient light reflection and enhance contrast, potentially incorporating photochromic materials, color filters, or polarizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a high reflective structure is used in the light emitting device, then the light emitting efficiency is improved, but the ambient light reflection increases causing reduced contrast
Solution Approach 1:
The optical window is divided into multiple zones with different transmittance characteristics. The first zone has higher transmittance to allow more emitted light through, while the second zone has lower transmittance to block ambient light reflection. This segmentation enables different regions of the optical window to serve different functions, resolving the contradiction between maintaining high light emitting efficiency and reducing ambient light reflection.
Solution Approach 2:
Different regions of the optical window are assigned different optical properties (transmittance values). The first zone is designed with higher transmittance locally optimized for light emission, while the second zone is designed with lower transmittance locally optimized for ambient light rejection. This local quality differentiation allows the system to simultaneously achieve high light emitting efficiency in one region and low ambient light reflection in another region.
2Object-affected harmful factors
If ambient light transmittance is reduced to improve contrast, then the contrast is improved, but the light emitting efficiency is compromised
Solution Approach 1:
The optical window is segmented into zones with different transmittance properties. The first zone maintains higher transmittance to preserve light emitting efficiency, while the second zone reduces transmittance to improve contrast by blocking ambient light. This segmentation allows the system to achieve both goals in different spatial regions simultaneously.
Solution Approach 2:
Different local regions of the optical window have different transmittance qualities optimized for different functions. The first zone has local quality optimized for light emission (higher transmittance), while the second zone has local quality optimized for contrast enhancement (lower transmittance). This local quality differentiation resolves the contradiction between contrast improvement and light emitting efficiency maintenance.
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
The solution effectively reduces ambient light reflection and improves contrast by strategically managing light transmittance through the optical window, balancing reflection and light emitting efficiency.
Implementation Method 1
the window includes a photochromic material
Data Source
AI summary
A light emitting device includes a window over a light emitting pixel. A light reflection performance of the light emitting pixel to an incoming ambient light is configured by the window to be appeared to have at least two regions, wherein one region of the at least two regions has a smaller transmittance to the incoming ambient light than the other.