Reflection Display Device Using Core-Shell Particles
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Solution Overview
Problem
Reflection type display devices face limitations in achieving high reflectance and wide color gamut due to the absorption and scattering of incident light by color filters, which restricts their ability to display vibrant colors effectively.
Innovation Solution
A reflection type display device incorporating a color panel with core-shell structured color-varying particles and a variable light-transmitting panel with core-shell structured black-varying particles, both driven by electrodes to control light transmission and reflection, eliminating the need for a color filter and enhancing reflectance and color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a color filter is used to display colors in a reflection type display device, then color gamut is improved, but reflectance deteriorates due to absorption and scattering of incident light
Solution Approach 1:
The patent removes the color filter component from the display device structure. Instead of using a color filter to achieve color display, the invention uses color-varying particles that can change their optical properties (transparent/colored state) in response to applied voltage, thereby eliminating the light absorption and scattering problems inherent in traditional color filters while maintaining color gamut performance
Solution Approach 2:
The patent employs color-varying particles whose optical parameters (transparency, color state) can be dynamically changed by applying voltage. These particles transition between transparent and colored states, enabling color display without the permanent light loss associated with color filters. This dynamic parameter change allows the system to achieve both high reflectance and wide color gamut
2Quantity of substance
If a color filter is used to display colors, then color representation is improved, but light intensity is reduced due to absorption and scattering
Solution Approach 1:
The color filter is extracted from the system and replaced with color-varying particles. These particles only absorb light when in their colored state (when color display is needed), and remain transparent when not in use, minimizing continuous light energy loss while maintaining color representation capability
Solution Approach 2:
The patent introduces dynamic control of light absorption through voltage-controlled color-varying particles. The particles can switch between transparent and colored states, allowing the system to dynamically adjust light absorption based on display requirements, thereby reducing unnecessary energy loss while maintaining color representation
3Manufacturing precision
If white and black particles are condensed in an electrophoretic display device, then display contrast is achieved, but reflectance and contrast ratio deteriorate
Solution Approach 1:
The patent applies different functional properties to different regions of the display medium. Color-varying particles are used in color display regions where selective light absorption is needed, while the reflective layer provides high reflectance in regions where brightness is prioritized. This local differentiation allows simultaneous achievement of contrast and reflectance
Solution Approach 2:
The patent uses a composite structure combining color-varying particles with a reflective layer. The color-varying particles provide color display and contrast functionality, while the reflective layer maintains high reflectance. This composite approach allows the system to achieve both display contrast and high reflectance that cannot be achieved with simple particle condensation
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 enables the display of high-brightness images with a wide color gamut and fast response time by minimizing light loss and avoiding absorption by color filters, achieving improved reflectance and color representation.
Implementation Method 1
the color panel includes a reflection layer reflecting incident light
Implementation Method 2
color-varying particles of a core-shell structure between the first and second electrodes
Implementation Method 3
variable light-transmitting panel over the color panel and including third and fourth electrodes and black-varying particles of a core-shell structure between the third and fourth electrodes
Data Source
AI summary
A reflection type display device includes a color panel including first and second electrodes and color-varying particles of a core-shell structure between the first and second electrodes, wherein the color-varying particles are divided and disposed into first, second and third pixel regions; and a variable light-transmitting panel over the color panel and including third and fourth electrodes and black-varying particles of a core-shell structure between the third and fourth electrodes, wherein the black-varying particles are divided and disposed into the first, second and third pixel regions, wherein the color panel includes a reflection layer reflecting incident light.