LCD Panel Step Structure for Under-Display Light Transmission
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Solution Overview
Problem
Conventional liquid crystal display panels have limited screen-to-body ratios due to the placement of components like camera modules and ambient light sensors, leading to reduced display area and increased frame areas, and suffer from display issues such as mura and heterochromatic display caused by alignment layer accumulation.
Innovation Solution
A liquid crystal display panel design with a light transmission region surrounded by a light shielding region and display region, featuring a step structure in the transition part between thicker and thinner areas to evenly apply alignment layers, reducing the risk of accumulation and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If components like camera modules and ambient light sensors are placed around the mobile phone screen, then the display area is reduced and frame area increases, but the screen-to-body ratio becomes low
Solution Approach 1:
The patent introduces a light transmission region that extends beyond the traditional display boundaries into the frame area, allowing optical components to be positioned in the dimension below the screen rather than competing for lateral space. This vertical integration enables the camera module and sensors to be placed in the light transmission region without reducing the display area, thereby maintaining a high screen-to-body ratio while accommodating necessary components.
2Ease of manufacture
If the alignment layer is applied on a film layer with large thickness difference, then the alignment layer accumulates at the edge, but this causes display anomalies such as mura and heterochromatic display
Solution Approach 1:
The patent introduces a transition part with a stepped structure that creates different local thickness zones. The first transition part has a first thickness and the second transition part has a second thickness different from the first. This local variation in thickness allows the alignment layer to be applied uniformly on each stepped surface without accumulating at edges, while still maintaining the necessary structural transition between the light transmission region and display region.
3Manufacturing precision
If a step structure is introduced to prevent alignment layer accumulation, then the manufacturing complexity increases, but the display quality improves
Solution Approach 1:
The patent divides the film layer structure into multiple segmented parts: a first film layer with a first transition part, and a second film layer with a second transition part. Each transition part has a specific thickness designed to create a stepped structure. This segmentation allows the alignment layer to be applied on each step separately, preventing accumulation while maintaining a relatively simple overall manufacturing process compared to more complex multi-layer solutions.
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 design increases the screen-to-body ratio by allowing optical devices like camera modules to be placed below the light transmission region, improves display quality by minimizing display anomalies, and ensures high transmittance and reliability through even alignment layer application.
Implementation Method 1
The light transmission region allows visible light to pass
Implementation Method 2
The light shielding region can shield visible light
Implementation Method 3
The liquid crystal display panel includes a first substrate, a first film group, a first alignment layer, a liquid crystal layer, a second alignment layer, a second film group, and a second substrate that are successively disposed in a laminated manner
Data Source
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AI summary
This application discloses a liquid crystal display panel that has a light transmission region, a light shielding region, and a display region. The liquid crystal display panel includes a first substrate, a first film group, a first alignment layer, a liquid crystal layer, a second alignment layer, a second film group, and a second substrate that are successively disposed in a laminated manner. The first film group includes a first display part located in the display region, a first transition part located in the light shielding region, and a first light transmission part located in the light transmission region. The second film group includes a second display part located in the display region, a second transition part located in the light shielding region, and a second light transmission part located in the light transmission region. In a direction from the first substrate to the second substrate, a thickness of the first display part is greater than that of the first light transmission part, the first transition part forms a step structure that connects the first display part to the first light transmission part, and a top surface that is of the first transition part and that is away from the first substrate includes one or more stepped surfaces. The liquid crystal display panel can increase a screen-to-body ratio. The application further discloses a liquid crystal display and an electronic device.