Hybrid Semiconductor Display Structure for Oxide-Channel Leakage Control
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Solution Overview
Problem
OLED display devices using oxide semiconductors are prone to leakage currents due to external light exposure in bottom gate structures, which affects performance and increases manufacturing complexity.
Innovation Solution
A display device design with a first transistor using polycrystalline semiconductors and a second transistor using oxide semiconductors, incorporating an external light blocking member to minimize leakage currents, and a mesh structure for driving voltage lines to enhance resolution and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bottom gate structure using oxide semiconductor is used, then manufacturing cost is reduced and uniformity is improved, but leakage current increases due to external light exposure
Solution Approach 1:
An external light blocking member is introduced as an intermediary element between the external environment and the oxide semiconductor channel. This member blocks external light from reaching the oxide semiconductor, thereby preventing photo-induced leakage current while allowing the bottom gate structure to maintain its manufacturing advantages
Solution Approach 2:
The light blocking member is positioned specifically at the region where external light would otherwise reach the oxide semiconductor channel. This localized protection addresses the leakage issue without affecting the overall device structure or manufacturing process
2Reliability
If oxide semiconductor is used in bottom gate structure, then carrier mobility and on/off ratio are improved, but device complexity increases due to light blocking requirements
Solution Approach 1:
The external light blocking member is merged with existing device structures such as the pixel electrode or common electrode. This integration approach provides light blocking functionality while utilizing already-present structural elements, thereby minimizing the increase in device complexity
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
Minimizes leakage currents and reduces power consumption while maintaining high resolution and display quality by utilizing a polycrystalline and oxide semiconductor structure with an external light blocking member and optimized voltage line layout.
Implementation Method 1
an external light blocking member positioned on the second source electrode and the second drain electrode and overlapping the second channel
Implementation Method 2
Electrons injected from a cathode that is an electrode and holes injected from an anode that is another electrode are bonded to each other in the organic light emitting layer to form excitons. Light is emitted while the excitons discharge energy.
Data Source
AI summary
A display device includes a substrate, first and second transistors on the substrate, a first electrode connected to one of the first and second transistors, a second electrode facing the first electrode, and a light emission member between the first and second electrodes, where the first transistor includes a first channel including a polycrystalline semiconductor member on the substrate, a first source electrode and a first drain electrode at respective opposite sides of the first channel, a first gate electrode overlapping the first channel, and a first insulating layer covering the first gate electrode, the second transistor includes a second gate electrode on the first insulating layer, a second channel including an oxide semiconductor member on the second gate electrode, second source and drain electrodes on the second channel, and an external light blocking member on the second source and drain electrodes and overlapping the second channel.