Display Device Metallization Layers Deflect LED Radiation
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Solution Overview
Problem
Display devices based on light-emitting diodes face malfunctions and degradation due to radiation emitted by the LEDs being absorbed by the carrier, leading to reliability and aging stability issues.
Innovation Solution
A display device design featuring a semiconductor body with a semiconductor layer sequence and a driver circuit, where metallization layers are used to deflect radiation away from the driver circuit, ensuring no direct optical path exists between the active region and the driver circuit, thereby preventing radiation absorption and potential malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driver circuit is integrated in the carrier, then the device complexity is reduced and manufacturing is simplified, but radiation emitted by the light-emitting diodes is absorbed in the carrier causing malfunctions and degradation
Solution Approach 1:
A reflective layer is introduced as an intermediary element between the light-emitting diodes and the driver circuit integrated in the carrier. This reflective layer redirects the emitted radiation away from the driver circuit, preventing absorption and degradation while maintaining the integrated structure. The reflective layer acts as a mediator that preserves both the manufacturing simplicity of integration and the reliability of the driver circuit.
2Reliability
If the driver circuit is arranged between the semiconductor body and the carrier, then radiation absorption in the carrier is prevented, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The driver circuit is positioned between the semiconductor body and the carrier, with a reflective layer strategically placed to redirect radiation. This arrangement uses the reflective layer as an intermediary to protect the driver circuit from radiation while maintaining a compact structure. The solution balances reliability improvement with manageable device complexity by optimizing the spatial arrangement and using the reflective layer to prevent direct radiation paths.
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
The solution enhances the reliability and aging stability of the display device by effectively preventing radiation-induced malfunctions and degradation, ensuring efficient operation and extended lifespan.
Implementation Method 1
The first metallization layer and/or the second metallization layer are implemented as reflective for the radiation to be generated in the active region in operation. The first metallization layer and/or the second metallization layer thus fulfill the function of a mirror layer, which deflects the radiation emitted in the direction of the driver circuit.
Data Source
AI summary
A display device includes at least one semiconductor body, which has a semiconductor layer sequence, which has an active region provided for producing radiation and forms a plurality of pixels. The device also includes a driver circuit that has a plurality of switches, which are each provided for controlling at least one pixel. A first metallization layer and/or the second metallization layer are electroconductively connected to at least one of the pixels. The first metallization layer and the second metallization layer are arranged overlapping one another in such a manner that, in a plan view onto the display device, the driver circuit is covered with at least one of the metallization layers at every point which overlaps with one of the pixels or is arranged between two adjacent pixels.