Solid-State Reflective Display Panel Phase Change Contrast
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Solution Overview
Problem
Current solid-state reflective display panels face challenges in achieving high brightness and contrast due to limitations in switching between states, leading to difficulties in achieving an ideal dark state and resulting light loss when filters are used to enhance contrast.
Innovation Solution
The proposed solution involves a solid-state reflective display panel with a three-dimensional structure comprising pixel reflection units that include sub-reflection units with a heating element, a reflecting layer, a resonant cavity, and a phase change material layer, allowing for adjustable refractive index and absorbance by switching between states, thereby improving contrast and brightness without the need for additional filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filters are used to enhance contrast, then display contrast is improved, but light loss increases and brightness decreases
Solution Approach 1:
The patent extracts and removes the filter component from the display system. Instead of using filters to achieve contrast, the invention uses the intrinsic optical properties of the phase change material layer and resonant cavity structure to directly modulate reflected light, thereby eliminating light loss associated with filters while maintaining high contrast
Solution Approach 2:
The patent changes the optical parameters (refractive index and absorbance) of the phase change material layer by controlling its phase transitions between crystalline and amorphous states. This parameter change enables direct modulation of reflectivity without requiring filters, achieving both high contrast and high brightness simultaneously
2Adaptability or versatility
If phase change material is used to switch between states, then reflectivity adjustment is achieved, but difficulty in achieving ideal dark state persists
Solution Approach 1:
The patent introduces a resonant cavity dimension beneath the phase change material layer to create a multi-layer optical system. This dimensional addition enables precise control of optical paths and interference patterns, allowing the dark state to be optimized independently from the reflectivity adjustment mechanism, thereby achieving both high adaptability and dark state quality
Solution Approach 2:
The patent employs a composite structure combining phase change material layer with resonant cavity and reflecting layer. This composite material system leverages the complementary properties of each layer: the phase change material provides reflectivity modulation, the resonant cavity enhances optical interference effects, and the reflecting layer ensures efficient light return, collectively achieving superior dark state quality
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
This configuration enables a darker dark state and higher brightness, improving display contrast and reducing light loss compared to conventional technologies, while also increasing the color gamut and fullness of the display.
Implementation Method 1
Refractive index and/or absorbance of a phase change material may be adjusted by controlling the phase change material to switch between a crystalline state and an amorphous state
Implementation Method 2
solid-state total-reflection display
Implementation Method 3
Each of the sub-reflection units includes a heating element
Data Source
AI summary
A solid-state reflective display panel and a display device are provided. The display panel includes an array substrate and pixel reflection units disposed on the array substrate. Each of the pixel reflection units includes sub-reflection units. Each of the sub-reflection units includes a heating element, a reflecting layer, a resonant cavity and a phase change material layer, stacked in sequence along a direction away from the array substrate. The sub-reflection units include at least a first sub-reflection unit and a second sub-reflection unit that are adjacent to each other. In one of the pixel reflection units, a first surface is a surface of the first sub-reflection unit away from the heating element, and a second surface is a surface of the second sub-reflection unit away from the heating element. An angle between the first surface and the second surface is less than 180 degrees.