OLED Display Screen Camera Opening Mask Segmentation
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Solution Overview
Problem
Conventional OLED display screens face challenges in achieving high screen-to-body ratio due to wider borders, and the reliability of thin film encapsulation is compromised by the presence of film layers at opening positions, which can lead to vapor and oxygen penetration.
Innovation Solution
The method involves using splicing complementary open masks to form film layers outside the opening preservation area on a TFT array substrate, employing fine metal masks without openings at the preservation area, and performing thin film encapsulation to ensure no film layers are deposited there, followed by creating a round opening for the camera position to enhance encapsulation reliability and increase screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional open masks with one-piece structure are used for evaporation, then the manufacturing process is simple, but film layers are deposited at the opening position which compromises encapsulation reliability
Solution Approach 1:
The patent divides the mask structure into multiple segments: a first open mask with a first opening, a second open mask with a second opening, and fine metal masks with corresponding openings. These segmented masks are positioned at different locations and used in sequence during evaporation, allowing precise control over where film layers are deposited while avoiding the opening preservation area.
Solution Approach 2:
The patent performs preliminary actions by first forming the first and second open masks with their respective openings, then positioning fine metal masks corresponding to pixel circuits before the actual evaporation process. This preliminary setup ensures that during evaporation, film layers are deposited only in intended areas and not at the opening preservation area, thereby ensuring encapsulation reliability.
2Ease of manufacture
If wider borders are used in smartphone design, then manufacturing is easier, but the screen-to-body ratio becomes lower affecting user experience
Solution Approach 1:
The patent segments the mask structure into multiple parts (first open mask, second open mask, fine metal masks) that can be precisely positioned and controlled. This segmentation enables the creation of display areas with extended boundaries and irregular shapes, including rounded corners, while maintaining manufacturing feasibility through controlled evaporation processes.
Solution Approach 2:
The patent changes the geometric parameters of the mask openings, using a first opening with a first radius and a second opening with a second radius that is different from the first radius. This parameter variation allows optimization of the display area shape and size, enabling higher screen-to-body ratios while maintaining ease of manufacture through controlled material deposition.
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 approach prevents film layers from being deposited at the opening preservation area during evaporation, thereby increasing the reliability of thin film encapsulation and achieving a higher screen-to-body ratio by narrowing the 'forehead' of the smartphone, allowing for a more extensive display area.
Implementation Method 1
The electro luminescence (EL) device film layers of an OLED display screen are realized mainly through evaporation by using open masks
Implementation Method 2
Thin film encapsulation (TFE) is currently an encapsulation technology frequently used for OLED display screens
Data Source
AI summary
An OLED display screen and a manufacturing method for the OLED display screen are disclosed. During the whole process of evaporation of EL film layers, the opening preservation area in the display area would not be evaporated by any film layers such as EL function film layers, cathodes, etc., and therefore the reliability of the thin film encapsulation at the opening preservation area can be increased. Also a round opening is made at a position corresponding to the camera in the display area, such that the “forehead” of the mobile intelligent device becomes narrower, full display can be reached more closely than notch design, and a greater screen-to-body ratio can be realized.