Phase Shifting Layers for Transparent Display Sharpness
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Solution Overview
Problem
Transparent display panels suffer from blurred and deteriorated sharpness and resolution of transmitted images due to diffraction grating patterns formed by light blocking members, color filters, and phase grating patterns in liquid crystal display devices, which affect the clarity of external objects viewed through the panel.
Innovation Solution
Incorporating a first and second phase shifting layer with a 180-degree phase difference, alternately arranged with each other, and disposed in regions corresponding to pixels or sub-pixels, to induce destructive interference and reduce light intensity between adjacent pixels or sub-pixels, thereby enhancing image sharpness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light blocking members, color filters, and thin film transistors are periodically arranged to form a grating pattern, then the display panel can block light leakage and enable color display, but the periodic arrangement causes diffraction of transmitted light which deteriorates the sharpness and resolution of external objects viewed through the transparent display panel
Solution Approach 1:
The patent applies phase shifting layer technology to change the optical phase parameter of transmitted light. By introducing phase shifting layers with specific thicknesses and refractive indices, the patent modifies the phase of light passing through different regions of the pixel, thereby compensating for the diffraction effects caused by the periodic grating structure and improving image sharpness
Solution Approach 2:
The patent converts the harmful diffraction effect into a beneficial effect by using the same periodic structure (grating pattern) to create phase differences that result in destructive interference of diffracted light. This transforms the diffraction problem caused by the grating structure into a solution where the grating pattern itself is used to cancel out unwanted diffraction orders
2Adaptability or versatility
If each pixel is divided into multiple sub-pixels with different voltages to improve side visibility, then the viewing angle is expanded, but the multiple sub-regions form additional grating patterns that increase light diffraction and reduce transmitted image sharpness
Solution Approach 1:
The patent applies different phase shifting layer configurations to different sub-pixel regions. Each sub-pixel area receives a tailored phase shift treatment based on its specific function and position, allowing optimal compensation for diffraction effects in each local region while maintaining the overall wide viewing angle capability
Solution Approach 2:
The patent modifies the phase parameter of light differently across various sub-pixel regions by using phase shifting layers with varying thicknesses or refractive indices. This localized parameter change compensates for the additional diffraction caused by the multi-sub-pixel structure
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 blurring and improves the sharpness and resolution of transmitted images by controlling the phase difference and refractive indices of the phase shifting layers, resulting in a clearer view of external objects through the transparent display panel.
Implementation Method 1
a phase difference between light having a predetermined wavelength transmitted through the first phase shifting layer and light having the predetermined wavelength transmitted through the second phase shifting layer is approximately 180 degrees
Implementation Method 2
controlling the phase difference and refractive indices of the phase shifting layers
Data Source
AI summary
A display panel includes: a plurality of pixels; and a first phase shifting layer and a second phase shifting layer, which overlap the pixels, where the first phase shifting layer and at least a portion of the second phase shifting layer are alternately arranged with each other, and a phase difference between light having a predetermined wavelength transmitted through the first phase shifting layer and light having the predetermined wavelength transmitted through the second phase shifting layer is approximately 180 degrees.