Display Panel Light-to-Heat Conversion Layer for High Transmittance
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Solution Overview
Problem
The existing display technologies face challenges in achieving high light transmittance in light sensing element settings due to the poor light transmittance performance of the light sensing element setting area, primarily because the cathodes of organic light-emitting diodes are integrally connected, making it difficult to pattern the cathodes effectively without using complex and impractical masks.
Innovation Solution
A manufacturing method for a display panel that includes forming a light-to-heat conversion layer in the light sensing element setting area, followed by the deposition of a light-emitting functional layer and a second electrode layer, where laser irradiation is used to convert light energy into thermal energy, causing the light-to-heat conversion layer to detach and remove all film layers from the substrate, thereby improving light transmittance in the light transmissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathodes of organic light-emitting diodes are integrally connected to ensure electrical continuity, then the electrical reliability is improved, but the light transmittance performance of the light sensing element setting area deteriorates
Solution Approach 1:
The cathode layer is segmented into multiple independent electrode regions corresponding to different sub-pixels (red, green, blue), with insulating layers between them. This segmentation allows the cathode to be electrically isolated in the light transmissive area while maintaining continuity in the light-emitting area, resolving the contradiction between electrical reliability and light transmittance.
Solution Approach 2:
Different regions of the cathode layer have different structural characteristics: the light-emitting area has continuous cathode structures for electrical continuity, while the light transmissive area has patterned or removed cathode structures for high light transmittance. This local differentiation allows each region to optimize its function without compromising the other.
2Illumination intensity
If the light-emitting functional layer and electrode layers are completely removed from the light transmissive area to improve light transmittance, then the light transmittance performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The light-to-heat conversion layer is formed as a preliminary structure before depositing the light-emitting functional layer and electrode layers. This preliminary action enables subsequent laser irradiation to selectively remove only the necessary layers in the light transmissive area, simplifying the manufacturing process compared to complete removal or complex masking techniques.
Solution Approach 2:
The mechanical masking process is replaced with laser irradiation technology. Instead of using physical masks to define the light transmissive areas, the patent uses laser energy to selectively activate the light-to-heat conversion layer, which then thermally removes the overlying layers through ablation. This substitution eliminates the complexity of mask alignment and positioning.
3Illumination intensity
If laser irradiation is used to remove film layers in the light transmissive area, then the light transmittance is improved, but the energy consumption increases
Solution Approach 1:
The light-to-heat conversion layer undergoes parameter changes when exposed to laser irradiation, transforming optical energy into thermal energy. This parameter change enables selective thermal ablation of the film layers with high precision, concentrating energy only where needed and minimizing overall energy consumption compared to bulk removal methods.
Solution Approach 2:
The laser irradiation induces phase transitions in the light-to-heat conversion layer and overlying film materials, causing them to transition from solid to vapor or plasma states through rapid heating and ablation. This phase transition mechanism enables efficient material removal with minimal energy input, as the energy is concentrated in a localized region and time.
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 method enhances the light transmittance performance of the light sensing element setting area by peeling off the light-emitting functional layer and second electrode layer from the substrate, allowing more ambient light to reach the light sensing elements, thus improving the functionality of the display device.
Implementation Method 1
the light-to-heat conversion layer converts light energy into thermal energy under laser irradiation and is thermally expanded and detached
Implementation Method 2
the light-to-heat conversion layer and all film layers located on a side of the light-to-heat conversion layer facing away from the substrate are removed via laser irradiation
Data Source
AI summary
A display panel includes a display area, and the display area includes a first display area and a second display area; the first display area and the second display area each include light-emitting areas, and the second display area further includes light transmissive areas. The manufacturing method includes forming, on a side of a substrate, a light-to-heat conversion layer covering at least a second display area; forming, on a side of the light-to-heat conversion layer facing away from the substrate, a light-emitting functional layer and a second electrode layer each covering the display area, where portions of the second electrode layer which are located in at least adjacent two light-emitting areas are connected; and removing, in at least part of the plurality of light transmissive areas, the light-to-heat conversion layer and all film layers located on a side of the light-to-heat conversion layer facing away from the substrate.