Electrochromic Display Panel Using Black Material for Color and Black States
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Solution Overview
Problem
Existing electrochromic display devices cannot achieve black display and have complex driving mechanisms due to inconsistent luminous efficiencies of red, green, and blue electrochromic materials.
Innovation Solution
An electrochromic display panel using a single black electrochromic material that transitions between transparent and black states, with electrochromic strips on a substrate and a layer on another substrate, powered independently to achieve color and black displays, and a driving method that illuminates with white light to generate specific colors or a black state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three-color electrochromic materials (red, green, blue) are used to achieve color display, then color display capability is improved, but device complexity increases and black display capability is lost
Solution Approach 1:
The patent uses a single black electrochromic material that changes between transparent and black states, combined with a color filter layer containing red, green, and blue filters. By controlling the black material's state and using the color filters, the display achieves color output without requiring three separate electrochromic materials, thus simplifying the driving mechanism while maintaining color display capability
Solution Approach 2:
The black electrochromic material serves multiple functions: it acts as the electrochromic layer for state control, works in conjunction with the color filter layer to produce colors, and can independently achieve black display when fully activated. This multi-functional design eliminates the need for separate red, green, and blue electrochromic materials
2Adaptability or versatility
If three-color electrochromic materials are used to achieve color display, then color display capability is improved, but black display capability deteriorates
Solution Approach 1:
The patent separates the color generation function from the electrochromic material itself. The black electrochromic material is responsible only for the transparent/black state transition, while the color filter layer handles color separation. This segmentation allows the black material to achieve full black display capability without being constrained by the need to produce multiple colors
Solution Approach 2:
The patent introduces a dedicated color filter layer with red, green, and blue filters that work with the black electrochromic material. When the black material is in transparent state, the color filters produce color display; when the black material is in black state, it blocks all light to achieve black display, thus resolving the contradiction between color and black display capabilities
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
Enables both color and black displays with a single electrochromic material, offering low cost, stable luminous efficiency, and a simple driving mode, improving upon prior art by reducing complexity and enhancing display capabilities.
Implementation Method 1
the black electrochromic material presents a transparent state when it is powered off, and presents a black state when it is powered on
Implementation Method 2
when the white light passes through the grating with the preset grating pitch, light with a preset color is generated by a corresponding pixel unit
Data Source
AI summary
The embodiments of the present invention disclose an electrochromic display panel, a driving method thereof and a display device; the electrochromic display panel comprises: a first substrate and a second substrate arranged with box alignment; the first substrate being divided into a plurality of pixel units; a plurality of electrochromic strips made of a black electrochromic material are arranged in each pixel unit of the first substrate; a electrochromic layer made of the black electrochromic material is arranged on the second substrate; the black electrochromic material presents a transparent state when it is powered off, and presents a black state when it is powered on. The electrochromic display panel provided by the embodiment of the present invention realizes both color display and black display with one electrochromic material; compared with the prior art, the embodiment of the present invention has advantages of low cost, stable luminous efficiency and simple driving mode.