Electrochromic Display Substrate for High Contrast Mirror Mode
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Solution Overview
Problem
Mirror display apparatuses face challenges in achieving high contrast and improved display effects due to the high reflectivity of reflective layers, which results in a poor display state and low contrast, especially when ambient light is reflected.
Innovation Solution
A display substrate with an electrochromic structure is used, where the transmittance of the electrochromic structure is correlated with the brightness of pixel units, allowing for real-time adjustment of transmittance through a pulse voltage, enhancing contrast and display effect by matching brightness levels across different regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reflective layer is used to realize mirror display, then the mirror function is achieved, but the contrast and display effect deteriorate due to high reflectivity
Solution Approach 1:
The patent applies an electrochromic layer that can dynamically change its optical properties between transparent and reflective states based on applied voltage. This dynamic adjustment allows the display to switch between mirror mode and display mode, resolving the contradiction by making the reflectivity controllable rather than fixed, thereby improving display contrast when in display mode while maintaining mirror functionality when needed.
Solution Approach 2:
The electrochromic layer changes its optical parameters (transmittance and reflectivity) in response to voltage changes. By controlling the voltage applied to the electrochromic layer, the system can adjust the reflectivity parameter to achieve high contrast display while maintaining the ability to function as a mirror when required, thus resolving the technical contradiction between mirror function and display contrast.
2Illumination intensity
If ambient light reflection is increased for mirror function, then mirror effect is improved, but display quality worsens due to reduced contrast
Solution Approach 1:
The electrochromic layer provides dynamic control over ambient light reflection. When voltage is applied, the layer becomes transparent, allowing high-quality display with excellent contrast. When no voltage is applied, the layer becomes reflective, providing strong mirror effect. This dynamic switching resolves the contradiction by decoupling the two functions temporally and spatially.
Solution Approach 2:
The electrochromic layer is positioned between the pixel units and the external environment, creating a localized optical control layer. This allows different optical properties to be achieved in the same physical space at different times, enabling both high ambient light reflection for mirror function and high display quality when needed, without compromising either function permanently.
3Adaptability or versatility
If a fixed reflective layer is used, then mirror display is achieved, but adaptability to different brightness levels worsens
Solution Approach 1:
The electrochromic layer serves multiple functions: it acts as a reflective layer for mirror mode, a transparent layer for display mode, and provides adaptive brightness control. This multi-functionality resolves the contradiction by enabling the same structure to adapt to different brightness levels and usage scenarios without requiring multiple separate components, thus maintaining structural simplicity while achieving high adaptability.
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 increases contrast and improves display effects by dynamically adjusting transmittance based on pixel unit brightness, ensuring a high contrast and accurate display across varying brightness levels, thereby overcoming the limitations of traditional mirror display technologies.
Implementation Method 1
an electrochromic film arranged between the first electrode and the second electrode
Data Source
AI summary
Provided are a display substrate, a display apparatus and a display method therefor. The display substrate includes: a base substrate; pixel units on the base substrate; and an electrochromic structure on a side of the pixel units that is away from the base substrate. The transmittance of the electrochromic structure is positively correlated with the brightness of the pixel units when displaying an image, such that the contrast of the display substrate is improved, and the display effect is improved.