Organic Electroluminescent Device Light Control Layer Anti-Peeping
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges in incorporating anti-peeping functions without compromising the properties of the functional layers due to high processing temperatures, which can affect the performance of the devices.
Innovation Solution
An organic electroluminescent device with a light control layer comprising a light transmitting structure and a light shielding structure disposed in the same layer, where the light shielding structure has a height h and the light transmitting structure has a width b, allowing for controlled exit angles of emitted light and integrating anti-peeping functionality without excessive heat exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-peeping function is added at the emitting layer within a processing chamber, then anti-peeping performance is improved, but the high processing temperature (up to 4827°C for carbon) deteriorates the properties of the functional layer already evaporated on the substrate
Solution Approach 1:
The patent divides the anti-peeping function from the emitting layer by creating a separate light control layer positioned between the emitting layer and the top surface. This segmentation allows the emitting layer to maintain its original properties without high-temperature processing, while the light control layer (using low-melting-point materials like wax or paraffin) provides the anti-peeping function independently.
Solution Approach 2:
The patent moves the anti-peeping function from the two-dimensional plane of the emitting layer to a three-dimensional structure by adding a light control layer with specific height (h) and light transmitting structure width (b). The exit angle is controlled by the geometric relationship tanθ = b/h, utilizing the vertical dimension to achieve anti-peeping performance without affecting the emitting layer's chemical composition.
2Object-affected harmful factors
If high temperature process is used to form light shielding structure, then light shielding performance is improved, but the high temperature adversely affects the organic functional layers already deposited on the substrate
Solution Approach 1:
The patent changes the material parameter of the light shielding structure from high-temperature carbon (boiling point 4827°C) to low-temperature materials such as wax, paraffin, or ice (melting points below 100°C). This parameter change allows the light shielding function to be achieved through phase change at low temperatures, preserving the integrity of the organic functional layers while still providing effective light blocking.
Solution Approach 2:
The patent employs materials like wax, paraffin, or ice for the light shielding structure - materials that are inexpensive and can be easily deposited and removed. These materials provide temporary light shielding during operation but can be replenished or replaced without complex high-temperature processing, avoiding damage to the organic layers.
Data Source
AI summary
The present disclosure discloses an organic electroluminescent device, a manufacturing method thereof, and a display device. The organic electroluminescent device includes a base substrate. A light control layer is disposed on the base substrate. The light control layer includes a light transmitting structure and a light shielding structure disposed in the same layer and spaced from each other. The light shielding structure has a height h. The light transmitting structure has a width b. The light control layer is used for shielding and transmitting light emitted by the organic electroluminescent device so that an exit angle of the emitted light is within an angle θ.