Pancake Lens Display Polarization Layout for RGB Ghost Reduction
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays, suffer from ghost phenomena due to wavelength-related issues, which affect luminance and light emission efficiency.
Innovation Solution
The display device incorporates phase retardation units with varying thicknesses for each sub-pixel to address wavelength-specific ghost phenomena, utilizing phase retardation plates and polarizing elements to improve luminance and light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution panel is applied to the HMD, then the display resolution is improved, but the ghost phenomenon for each wavelength occurs and luminance decreases
Solution Approach 1:
The patent applies different phase retardation plate thicknesses to different sub-pixels (red, green, blue) based on their specific wavelength characteristics. Each sub-pixel receives customized phase retardation treatment tailored to its wavelength, which eliminates the ghost phenomenon while maintaining high display resolution.
2Measurement precision
If a high-resolution panel is applied to the HMD, then the display resolution is improved, but light emission efficiency decreases
Solution Approach 1:
The patent customizes the phase retardation plate thickness for each sub-pixel type (red, green, blue) according to their specific wavelengths. This localized optimization ensures that each sub-pixel operates at peak efficiency, thereby improving overall light emission efficiency while maintaining high display resolution.
3Device complexity
If uniform phase retardation plates are used for all sub-pixels, then the device structure is simplified, but wavelength-specific ghost phenomena occur
Solution Approach 1:
Instead of using uniform phase retardation plates for all sub-pixels, the patent implements different thicknesses for red, green, and blue sub-pixels. This localized differentiation eliminates wavelength-specific ghost phenomena by tailoring the phase retardation to match each sub-pixel's wavelength characteristics.
Solution Approach 2:
The patent segments the phase retardation function by assigning separate thickness values to different sub-pixel types. This segmentation allows each sub-pixel to receive optimized phase retardation treatment, eliminating the need for a one-size-fits-all approach and thereby removing wavelength-specific ghost phenomena.
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 ghost phenomena and enhances luminance and light emission efficiency by tailoring phase retardation plate thicknesses to specific wavelengths, improving overall display performance.
Implementation Method 1
a first phase retardation unit on the display unit, and including first phase retardation plates respectively overlapping with the first to third sub-pixels and having different phase differences from each other
Implementation Method 2
a first polarizing plate on the first phase retardation unit; a polarizing element layer on the second phase retardation unit, and including a pancake lens
Data Source
AI summary
A display device according to one or more embodiments of the present disclosure includes: a substrate; a display unit on the substrate, and including first to third sub-pixels configured to emit light of different colors; a first phase retardation unit on the display unit, and including first phase retardation plates respectively overlapping with the first to third sub-pixels and having different phase differences from each other; a first polarizing plate on the first phase retardation unit; a second phase retardation unit on the first polarizing plate, and including second phase retardation plates respectively overlapping with the first to third sub-pixels and having different phase differences from each other; and a polarizing element layer on the second phase retardation unit, and including a pancake lens.