OLED Substrate Shared Transistor Layers for Uniform Brightness
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Solution Overview
Problem
The uneven brightness of light-emitting layers in OLED display devices due to different anode resistance and thicknesses across pixels, which limits the development of OLED technology, especially in large-sized displays, and the complexity of existing OLED display substrate formation processes.
Innovation Solution
An OLED display substrate with a photosensitive thin film transistor and a driving thin film transistor, where at least part of their film layers are made of the same material and formed in the same patterning process, allowing for light detection and optical compensation to achieve uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate material layers are used for photosensitive thin film transistor and driving thin film transistor, then each transistor can be optimized independently, but the formation process becomes complex and production cost increases
Solution Approach 1:
The patent merges the material layers of the photosensitive thin film transistor and driving thin film transistor by forming their active layers, gate electrodes, and other structural layers simultaneously in the same patterning process. This integration reduces the number of fabrication steps while maintaining the functional independence and performance optimization of each transistor type.
Solution Approach 2:
The patent employs universal material layers that serve dual purposes: the same active layer material and electrode materials are used for both the photosensitive thin film transistor and driving thin film transistor. This multi-functional approach allows a single patterning process to create both transistor types, simplifying the overall formation process while ensuring consistent material quality across different transistor functions.
2Manufacturing precision
If multiple patterning processes are used to form different transistor layers, then each layer can be precisely controlled, but production time and cost increase
Solution Approach 1:
The patent combines multiple patterning operations into a single patterning process by designing the photosensitive thin film transistor and driving thin film transistor structures to be formed simultaneously. This merging approach maintains precise layer formation control through careful process design while significantly improving production efficiency by eliminating redundant fabrication steps.
3Ease of manufacture
If separate fabrication processes are used for different transistor types, then process optimization is easier, but production cost and complexity increase
Solution Approach 1:
The patent implements a universal fabrication approach where the same patterning process and material deposition steps are used to create both photosensitive thin film transistor and driving thin film transistor structures. This universal process maintains ease of manufacture through standardized procedures while reducing overall device fabrication complexity by eliminating the need for separate optimized processes for each transistor type.
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 solution simplifies the OLED display substrate formation process, reduces production costs, and ensures uniform light emission across OLED displays by using shared material layers for the transistors, thereby addressing the brightness unevenness issue.
Implementation Method 1
a photosensitive thin film transistor located on the base substrate and configured to be capable of detecting light emitted by the OLED light-emitting unit and generating an electrical signal
Implementation Method 2
When the electron and the hole meet near a certain molecule in an organic light-emitting layer, due to the coulomb effect, the electron and the hole will be bound together to form an exciton, and recombination occurs after the exciton diffuses and drifts in the organic light-emitting layer to an appropriate position. Since the exciton itself is in an excited state, energy is released when recombined, and a part released in a form of radiation is light-emitting.
Data Source
AI summary
An Organic Light-emitting Diode (OLED) display substrate, a method of forming the same and a display device are provided. The OLED display substrate includes: a driving thin film transistor located on a base substrate and configured to drive an OLED light-emitting unit to emit light; and a photosensitive thin film transistor located on the base substrate and configured to be capable of detecting light emitted by the OLED light-emitting unit and generating an electrical signal, at least a part of film layers of the photosensitive thin film transistor and at least a part of film layers of the driving thin film transistor are disposed at a same layer and made of a same material.