Wavelength-Selective Transmittance Control Layer for Display Devices
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Solution Overview
Problem
Display devices face challenges in improving image quality due to high reflectance, with attempts to reduce reflectance through polarizing plates leading to decreased luminous efficiency and issues with under-display camera techniques.
Innovation Solution
A display device with a transmittance control layer on or under a touch sensor layer, controlling light transmittance by increasing it in blue and red regions and reducing it in green regions, allowing for improved light transmittance and reduced reflectance without the need for a polarization layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is applied to reduce reflectance, then image quality is improved, but luminous efficiency decreases due to low front transmittance
Solution Approach 1:
The transmittance control layer is designed with wavelength-selective properties, allowing different transmittance values for different wavelength regions. Specifically, it provides high transmittance in blue (450-490nm) and red (610-680nm) regions while providing low transmittance in green (500-560nm) region, enabling localized optical property optimization without sacrificing overall luminous efficiency
Solution Approach 2:
The patent changes the optical parameters of the transmittance control layer to achieve wavelength-dependent transmittance. By controlling the thickness and material composition of the layer, the patent optimizes transmittance in specific wavelength regions while maintaining low reflectance across all regions, thereby improving both image quality and luminous efficiency
2Object-affected harmful factors
If a polarizing plate is applied to reduce reflectance, then image quality is improved, but transmittance in under-display camera area decreases
Solution Approach 1:
The transmittance control layer provides spatially and spectrally selective transmittance control. In the under-display camera area, it allows high transmittance for blue and red wavelengths that are critical for camera sensing, while maintaining low reflectance properties. This localized optimization ensures sufficient light reaches the camera sensor without requiring a polarizing plate
3Stability of the object's composition
If a polarization layer is removed to improve flexibility, then flexibility is improved, but reflectance control capability is reduced
Solution Approach 1:
The transmittance control layer is designed with optimized thickness and material parameters to compensate for the removal of the polarization layer. By adjusting these parameters, the layer achieves both low reflectance and wavelength-selective transmittance control, maintaining image quality while allowing the use of flexible display materials throughout the stack
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
Enhances image quality and luminous efficiency while maintaining reflectance reduction, supporting under-display camera functionality and offering flexibility and reduced driving voltage.
Implementation Method 1
controlling transmittance according to red, blue and green wavelength regions in such a manner as to increase respective transmittance in the blue light region and the red light region to improve light transmittance, and to reduce transmittance in the green light region to reduce reflectance
Data Source
AI summary
The present disclosure provides a display device including a substrate, an encapsulation layer over the substrate, a touch sensor layer on the encapsulation layer and including a plurality of touch sensors, and a transmittance control layer on or under the touch sensor layer.