Organic Light-Emitting Display Pixel Segmentation for External Light Transmittance
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Solution Overview
Problem
Organic light-emitting display apparatuses face challenges in maximizing external light transmittance and minimizing image distortion due to the presence of devices like TFTs and organic light-emitting devices in regions meant for light penetration.
Innovation Solution
The design incorporates a substrate with pixels having distinct regions for light emission and light penetration, where the light penetration regions are connected to form groups and sets that are obliquely disposed to reduce space differences and enhance transmittance, and include insulation films and electrodes with penetration windows to maximize external light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices like TFTs and organic light-emitting devices are placed in regions meant for light penetration, then device functionality is achieved, but external light transmittance is reduced
Solution Approach 1:
Each pixel is divided into two distinct regions: a first region for light emission containing the organic light-emitting device and TFTs, and a second region for light penetration that remains substantially free of devices. This segmentation allows the display to simultaneously achieve device functionality in the first region and high external light transmittance in the second region, resolving the contradiction between these two requirements.
2Reliability
If devices are placed in light penetration regions, then pixel circuit functionality is achieved, but image distortion occurs
Solution Approach 1:
The pixel is segmented into a first region containing pixel circuit units (TFTs, capacitors, etc.) and a second region free of devices for light penetration. This spatial separation ensures that pixel circuit functionality is maintained while preventing device-induced image distortion in the light penetration region, as the second region remains substantially free of devices that could cause distortion.
Solution Approach 2:
Different regions of the pixel are assigned different functional qualities: the first region is optimized for electrical functionality with pixel circuit units, while the second region is optimized for optical quality with high light transmittance and no devices. This local differentiation allows each region to perform its intended function without compromising the other, preventing image distortion while maintaining circuit functionality.
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 increases external light transmittance and reduces image distortion by optimizing the arrangement of light penetration regions and device placement, improving the overall performance of the organic light-emitting display apparatus.
Implementation Method 1
an intermediate layer including an organic emitting layer between the first electrodes and the second electrode
Implementation Method 2
a second region through which external light penetrates
Data Source
AI summary
An organic light-emitting display apparatus including: a substrate; a plurality of pixels on a first surface of the substrate, each pixel of the pixels having a first region in which visible rays are emitted and a second region through which external light penetrates, such that the plurality of pixels provide a plurality of first and second regions; a plurality of pixel circuit units in the first region of each pixel, each pixel circuit unit of the pixel circuit units including at least one thin film transistor (TFT); a plurality of first electrodes independently disposed in the first region of each pixel, each first electrode of the first electrodes being electrically connected to each pixel circuit unit; a second electrode facing the first electrodes, the second electrode being electrically connected throughout the pixels; and an intermediate layer including an organic emitting layer between the first electrodes and the second electrode.