Stacked TFT Display Layout for High Transmittance
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Solution Overview
Problem
Conventional display devices face challenges in increasing transmittance while maintaining performance, as securing space for light-emitting devices degrades their performance.
Innovation Solution
A display device design that includes a substrate with both pixel and transmission areas, featuring a pixel circuit with thin-film transistors in multi-layer films, and a light-transmitting filling layer in transmission openings, allowing for reduced pixel circuit area and increased transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If area is secured for light-emitting device, then display device performance is improved, but transmittance deteriorates
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration, placing pixel circuits on one substrate and light-emitting devices on another substrate above it. This vertical stacking enables both the pixel circuits and light-emitting devices to coexist without occupying the same planar area, thereby improving both display performance and transmittance simultaneously.
Solution Approach 2:
The patent implements a nested structure where the first substrate containing pixel circuits is positioned below the second substrate containing light-emitting devices. The light-emitting device substrate is effectively nested above the pixel circuit substrate, allowing both functional elements to be integrated in a compact vertical arrangement that resolves the area conflict.
2Illumination intensity
If transmittance is increased, then light transmission is improved, but light-emitting device performance deteriorates
Solution Approach 1:
By separating pixel circuits and light-emitting devices into different vertical layers (different substrates), the patent allows the light-emitting devices to be positioned where they can emit light effectively without being constrained by planar area limitations. This enables higher transmittance in transmission areas while maintaining adequate light-emitting device performance through optimized vertical placement.
Data Source
AI summary
A display device includes a substrate including a pixel area and a transmission area, and a pixel circuit disposed in the pixel area. The pixel circuit includes a first thin-film transistor included in a first multi-layer film, and a second thin-film transistor included in a second multi-layer film on the first multi-layer film. The first thin-film transistor and the second thin-film transistor are electrically connected to each other. The display device also includes a display element disposed on the second multi-layer film and including a pixel electrode electrically connected to the second thin-film transistor via a contact hole defined in the second multi-layer film, an opposite electrode facing the pixel electrode, and an intermediate layer between the pixel electrode and the opposite electrode.