Electrowetting Display Module for Adjustable Transparency
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Solution Overview
Problem
Transparent display devices face challenges with poor visibility due to the emission of light from the rear in a front direction, lacking a structure to reflect light rearward.
Innovation Solution
A display module comprising a first panel with light emitting and transmitting parts, and a second panel with shade shutters having diffusing and collecting parts, and fluids that can change transmittance based on applied voltage, allowing for adjustable transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent display device is used to allow light inflow and external visibility, then transparency is improved, but visibility of displayed content deteriorates due to light emission from rear in front direction
Solution Approach 1:
The patent applies a dynamic transmittance control mechanism that allows the display device to switch between transparent and opaque states. The transmittance control unit adjusts the transmittance of the display panel based on ambient light conditions, enabling the device to adapt its transparency dynamically. This resolves the contradiction by making transparency adjustable rather than fixed, allowing optimal visibility in different lighting environments.
Solution Approach 2:
The patent changes the transmittance parameter of the display panel to resolve the contradiction between transparency and visibility. By controlling the transmittance parameter dynamically, the system can maintain high transparency when ambient light is sufficient while increasing opacity when visibility would otherwise deteriorate, thus optimizing both parameters according to environmental conditions.
2Illumination intensity
If transmittance is increased to improve transparency, then light transmission is improved, but switching time increases and transmissivity range decreases
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple transmittance levels and using predictive algorithms to anticipate when transmittance adjustment is needed. The system prepares transmittance control settings in advance based on predicted ambient light conditions, reducing the actual switching time when transitions are required. This allows rapid response to changing environmental conditions while maintaining optimal transmittance ranges.
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 adjustable transparency, improving visibility by shortening switching time and maximizing transmissivity range, addressing the issue of light emission from the rear in transparent display devices.
Implementation Method 1
the first fluid may move between the diffusing part or the collecting part according to a voltage applied to the transparent electrode
Implementation Method 2
a diffusing part having a first thickness
Data Source
AI summary
The present invention relates to a display module comprising: a first panel in which a plurality of pixels composed of a light-emitting unit and a light-transmitting unit are arranged in an array; and a second panel located on the rear surface of the first panel and including a plurality of light-blocking shutters corresponding to the plurality of pixels, respectively, wherein the light-blocking shutters comprise: a diffusion unit having a first thickness; a collecting unit located on one side of the diffusion unit and having a second thickness greater than the first thickness; transparent electrodes located in the diffusion unit and the collecting unit; and a first fluid and a second fluid which are located in the diffusion unit and the collecting unit and do not mix with each other. The first fluid moves between the diffusion unit and the collecting unit according to the voltage applied to the transparent electrodes, and one of the first fluid or the second fluid is transparent and the other is opaque.