Electrochromic Light Control Device for Transparent Displays
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Solution Overview
Problem
Transparent display devices, particularly those using organic light emitting technology, face challenges with contrast ratio deterioration in bright environments due to slow switching times between transmissive and light-shielding modes in electrochromic devices, which are inadequate for large-sized applications like TVs.
Innovation Solution
A light controlling device comprising a first and second base film with patterned auxiliary electrodes and transparent electrodes, an electrochromic layer between them, and a liquid electrolyte for rapid switching between transmissive and light-shielding modes, reducing switching times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If an electrochromic device is used as a light controlling device in a large-sized transparent display device, then the transmissive mode can be switched to a light-shielding mode at a low driving voltage, but the switching time from transmissive mode to light-shielding mode or from light-shielding mode to transmissive mode becomes long due to low response speed
Solution Approach 1:
The electrochromic device is divided into multiple sub-regions with independently controllable electrodes, allowing selective switching of different areas. This segmentation enables faster overall switching by activating only the necessary portions rather than switching the entire large-sized device uniformly.
Solution Approach 2:
The patent employs periodic voltage application to the electrochromic layer, using alternating voltage cycles to accelerate the switching process. By applying voltage in periodic pulses rather than continuous DC, the response time is reduced while maintaining the low driving voltage requirement.
2Adaptability or versatility
If a transparent display device includes a transmissive area to allow a user to view an object or background disposed on a rear surface, then the device achieves better use of space and design, but a bright room contrast ratio is deteriorated
Solution Approach 1:
The light controlling device provides dynamic switching between transmissive and light-shielding modes, allowing the display to adapt to different viewing conditions. The electrochromic layer can be electrically controlled to change its optical properties in real-time, enabling the device to maintain both transmissive capability and contrast ratio depending on the operational mode.
Solution Approach 2:
The patent implements different optical properties in different areas of the display device. The electrochromic layer is selectively positioned and controlled to provide light shielding only where needed, while maintaining transmissivity in areas where background viewing is desired. This local differentiation resolves the contradiction between overall transmissivity and local contrast ratio.
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 faster switching between modes, improving contrast ratio performance in bright environments and addressing the limitations of existing electrochromic devices for large-sized transparent displays.
Implementation Method 1
an electrochromic layer arranged between the first transparent electrode and the second transparent electrode
Implementation Method 2
a liquid electrolyte for rapid switching between transmissive and light-shielding modes
Data Source
AI summary
A light controlling device that may reduce the time required for mode switching from a transmissive mode to a light-shielding mode or from a light-shielding mode to a transmissive mode, a transparent display device including the same, and a method for manufacturing the same are discussed. The light controlling device according to an embodiment includes a first base film and a second base film; first auxiliary electrodes arranged on one surface of the first base film facing the second base film, and patterned at a predetermined interval; second auxiliary electrodes arranged on one surface of the second base film facing the first base film, and patterned at a predetermined interval; a first transparent electrode arranged on the first auxiliary electrodes; a second transparent electrode arranged on the second auxiliary electrodes; and an electrochromic layer arranged between the first transparent electrode and the second transparent electrode.