OLED Display Panel Light Transmissive Zone Evaporation Masking
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Solution Overview
Problem
The integration of a hole in OLED display panels for accommodating front cameras and earpieces disrupts the regularity and integrity of the display area, and existing methods struggle to effectively avoid the light transmissive zone during the evaporation process of the organic electroluminescent device and thin film encapsulation layer, limiting full-screen display capabilities.
Innovation Solution
A display panel design featuring a light transmissive zone within the display area, where no common layer containing the organic electroluminescence device and thin film encapsulation layer is present, along with a preparation method involving a shielding element and masks to steer clear of the light transmissive zone during evaporation, allowing for flexible placement and shape of the transmissive zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hole is provided in the display area to accommodate front camera and earpiece, then devices can be placed in the display area, but the regularity and integrity of the display area is disrupted and full-screen display cannot be realized
Solution Approach 1:
The patent extracts the light transmissive zone function from the display area by creating a separate transparent region where no common layer is formed. This allows the light transmissive zone to be disposed within the display area without disrupting the integrity of the surrounding display region, enabling full-screen display while accommodating front camera and earpiece devices.
Solution Approach 2:
The patent segments the display area into a display zone with common layer and a light transmissive zone without common layer. This segmentation allows different functional regions to coexist within the display area, maintaining the integrity of the display zone while providing a dedicated transparent area for light transmission and device placement.
2Ease of manufacture
If mask evaporation is applied to form hole on display area mask, then cathode and thin film encapsulation layer can be formed, but it is difficult to steer clear of the light transmissive zone during evaporation process
Solution Approach 1:
The patent applies preliminary action by forming the light transmissive zone before the evaporation process of the common layer. By pre-defining the transparent region where no common layer is formed, the subsequent evaporation process can easily avoid this area without requiring complex mask alignment, thereby improving manufacturing precision while maintaining ease of manufacture.
3Ease of manufacture
If common layer is disposed on the light transmissive zone, then complete OLED structure is formed, but light transmittance is reduced and display performance is compromised
Solution Approach 1:
The patent applies local quality by creating a region-specific structure where the light transmissive zone has no common layer while the display zone has the complete common layer. This local differentiation ensures that the light transmissive zone maintains high light transmittance for optimal display performance, while the display zone has the complete OLED structure for proper light emission and color display.
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 ensures the regularity and integrity of the display area, enabling full-screen displays without increasing the screen-to-body ratio and enhancing light transmittance, resulting in improved display performance.
Implementation Method 1
When there is current passing through, the organic material will emit light
Implementation Method 2
how to steer clear of the light transmissive zone when forming a membrane layer by an evaporation process
Data Source
AI summary
An organic light emitting diode (OLED) display panel includes a display area, and the display area includes: a light transmissive zone; a display zone surrounding the light transmissive zone; and a common layer disposed on the display zone; the common layer includes an organic electroluminescence device and a thin film encapsulation layer, and there is no common layer disposed on the light transmissive zone.