Display Panel Backplate Phase Control for Under-Screen Camera Photos
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Solution Overview
Problem
Current OLED and LED panels with general backplate structures cause rainbow stripes in photos taken by under-screen cameras, degrading image quality.
Innovation Solution
A display panel design with a specific configuration of the panel main body and backplate module, where the total in-plane phase difference value is less than 200 nanometers or greater than 7000 nanometers, including a polarization layer and a backplate module with alternating flexible and adhesive layers, to minimize optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If general materials are adopted in the backplate structure, then manufacturing is simple and cost is low, but rainbow stripes appear in photos taken by under-screen cameras
Solution Approach 1:
The patent applies parameter changes by precisely controlling the in-plane phase difference of the backplate structure to be less than 200 nanometers or greater than 7000 nanometers. This quantitative parameter control eliminates the rainbow stripe effect in under-screen camera photos while maintaining manufacturing feasibility through standardized material selection and process control.
Solution Approach 2:
The patent employs composite materials in the backplate structure, combining multiple layers with different optical properties. This includes using specific polymer materials and adhesive layers with controlled refractive indices and phase differences, creating a composite structure that eliminates rainbow stripes while remaining manufacturable.
2Object-affected harmful factors
If the in-plane phase difference is controlled to less than 200 nanometers or greater than 7000 nanometers, then rainbow stripes are eliminated, but manufacturing precision requirements increase
Solution Approach 1:
The patent transforms a complex optical performance requirement into a controllable manufacturing parameter by specifying the in-plane phase difference range (less than 200 nm or greater than 7000 nm). This enables manufacturers to control the parameter through material selection and processing conditions rather than requiring ultra-precise dimensional control.
Solution Approach 2:
The patent allows the use of conventional, cost-effective materials and manufacturing processes that can achieve the required phase difference control within reasonable tolerances. This approach accepts some variability in individual components while maintaining overall performance through the cumulative effect of multiple layers.
3Object-affected harmful factors
If a multi-layer backplate module with flexible and adhesive layers is used, then optical interference is minimized, but device structure becomes more complex
Solution Approach 1:
The patent segments the backplate structure into multiple functional layers, including flexible layers and adhesive layers, each with specific optical properties. This segmentation allows independent optimization of each layer's thickness and material composition to control the overall in-plane phase difference and eliminate optical interference.
Solution Approach 2:
The multi-layer backplate module performs multiple functions simultaneously: it provides mechanical support, manages stress through flexible layers, bonds components through adhesive layers, and controls optical interference through the cumulative phase difference effect. This multi-functionality justifies the increased structural complexity.
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 solution effectively reduces or eliminates rainbow stripes in photos, thereby improving image quality during under-screen photography.
Implementation Method 1
A part of the backplate module and the panel main body disposed in a stack and corresponding to the functional region has a total in-plane phase difference value, and the total in-plane phase difference value is less than 200 nanometers or greater than 7000 nanometers
Data Source
AI summary
A display panel and a display device including a functional region corresponding to a camera are provided. The display panel includes the panel main body, the polarization layer, and the backplate module. The polarization layer is disposed on the light-exiting side of the panel main body. The backplate module is disposed on the side of the panel main body away from the polarization layer. A part of the backplate module and the panel main body disposed in a stack and corresponding to the functional region have a total in-plane phase difference value, and the total in-plane phase difference value is less than 200 nanometers or greater than 7000 nanometers.