Scattering Layer Mitigates Color Shift in Reflective Displays
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Solution Overview
Problem
Conventional reflective displays experience color shift and reduced contrast when viewed from a side angle due to red shift of light caused by increased resonant length, leading to cross color phenomena.
Innovation Solution
A pixel unit structure incorporating a scattering layer with nanometer-sized metal microparticles or organic particles dispersed in a planarization layer, along with a transmission enhanced layer, is introduced to scatter or absorb abnormal light, mitigating color shift and enhancing contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflective display structure is used, then the display can reflect ambient light, but color shift and cross color phenomena occur when viewed from side angles
Solution Approach 1:
The patent introduces a scattering layer with specific microparticles (absorbers and scatterers) at specific positions in the optical path to selectively scatter and absorb abnormal light wavelengths. This local modification of light interaction properties at the scattering layer position resolves the color shift issue without affecting the overall reflective display function
Solution Approach 2:
The scattering layer acts as an intermediary between the resonant cavity and the viewer. It mediates the light by scattering and absorbing abnormal wavelengths that cause color shift, while allowing normal display light to pass through, thus resolving the contradiction between maintaining brightness and ensuring color accuracy
2Loss of energy
If the resonant length is increased to enhance reflection, then more ambient light is reflected, but red shift occurs causing color distortion
Solution Approach 1:
The patent converts the harmful effect of red-shifted light into a beneficial outcome by using the scattering layer to selectively scatter and absorb the abnormal long-wavelength light. The increased resonant length that causes red shift is compensated by the scattering layer that removes the harmful wavelengths, transforming the problem into a solution
3Manufacturing precision
If a scattering layer with microparticles is added to reduce color shift, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The scattering layer uses composite material concepts by combining different types of microparticles (absorbers like metal particles and scatterers like organic particles or air microcavities) within a single layer. This composite approach achieves superior color accuracy by addressing multiple light interaction mechanisms simultaneously without requiring multiple separate layers
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 proposed structure effectively reduces color shift and improves contrast ratio by scattering or absorbing abnormal light, providing a better display effect when viewed from side angles.
Implementation Method 1
A pixel unit structure incorporating a scattering layer with nanometer-sized metal microparticles or organic particles dispersed in a planarization layer... to scatter or absorb abnormal light
Implementation Method 2
the microparticle includes an absorber that absorbs a light with a specific wavelength
Data Source
AI summary
The present disclosure provides a pixel unit, a display panel, and a display device, which relates to the field of display technology. The pixel unit includes: a base substrate; a reflective layer, disposed on a side of the base substrate; a resonant layer, disposed on a side of the reflective layer away from the base substrate; a transflective layer, disposed on a side of the resonant layer away from the base substrate; and a scattering layer, disposed on a side of the transflective layer away from the base substrate.