Transparent OLED Pixel Segmentation for Light Transmission
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Solution Overview
Problem
Transparent organic light-emitting display devices face issues with low transmittance and image distortion due to the scattering of light by the patterns of organic light-emitting diodes, thin film transistors, and wires, which are not adequately addressed by current technologies.
Innovation Solution
The design includes a substrate with pixels having distinct light-emitting and light-transmitting regions, separated by insulating layers with light-absorbing materials and transmittance windows, which minimize the visibility of conductive patterns and enhance light transmission by separating and hiding conductive elements, thereby reducing light scattering and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent thin film transistors and transparent organic light emitting devices are used to create a transparent display device, then the device can transmit external light when off, but the transmittance of the entire device remains low due to the patterns of organic light-emitting diodes, thin film transistors, and wires
Solution Approach 1:
The display device is divided into multiple pixels, each pixel containing distinct light-emitting and light-transmitting regions. This segmentation allows different areas to serve different functions: light emission in the first region and light transmission in the second region, thereby resolving the contradiction between displaying images and transmitting external light.
Solution Approach 2:
Different regions of each pixel are assigned different optical properties. The first region (light-emitting region) contains conductive patterns for displaying images, while the second region (light-transmitting region) is designed with higher transmittance for transmitting external light. This local differentiation resolves the contradiction by allowing each region to optimize for its specific function.
2Loss of information
If gaps between patterns are reduced to a few nanometers to minimize visibility, then the patterns become less visible, but light scattering occurs as gaps overlap with wavelengths of visible light causing distorted images to be transmitted
Solution Approach 1:
Each pixel is segmented into light-emitting and light-transmitting regions with clear boundaries. The light-transmitting regions are positioned and sized to minimize the impact of conductive patterns on external light transmission, thereby reducing image distortion while preventing light scattering issues.
Solution Approach 2:
The insulating layer serves as an intermediary between the conductive patterns and the external light. By positioning the light-transmitting regions appropriately and using the insulating layer as a buffer, the direct interaction between conductive patterns and light is reduced, minimizing scattering and distortion effects.
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 improves the transmittance and reduces image distortion, allowing for clearer external light transmission and maintaining image integrity while preventing conductive patterns from acting as slits that distort the image.
Implementation Method 1
a second insulating layer formed on the first insulating layer to cover edges of the plurality of first electrodes, formed of a light absorbing material
Data Source
AI summary
An organic light-emitting display device that is transparent and prevents distortion of an image transmitted therethrough by preventing light from scattering during image display. The organic light-emitting display device comprises a plurality of pixels, in which each pixel includes a light transmission area, a light emitting area, and a light absorption area. The light transmission area is configured to pass visible light incident thereto. The light absorption is configured to absorb visible light incident thereto.