Transflective Electrophoretic Display with Transparent Walls
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Solution Overview
Problem
Existing transflective electrophoretic display devices face issues with light leakage due to partitioning walls, complex design, and high power consumption, especially when operating in low-light conditions or in portable devices.
Innovation Solution
A transflective electrophoretic display device design that allows both surrounding light and backlight to pass through completely, with adjustable backlight intensity based on ambient light conditions, using a transparent top substrate, in-plane electrodes, and transparent partitioning walls to enhance contrast and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If partitioning walls are used to separate display cells, then structural integrity is improved, but light leakage occurs and display quality deteriorates
Solution Approach 1:
The patent removes the partitioning walls that cause light leakage while maintaining structural integrity through an alternative encapsulation approach. The display medium is sealed between a flexible encapsulation layer and a substrate without requiring internal partitioning walls, thus eliminating the light leakage problem while preserving structural strength.
Solution Approach 2:
The patent divides the display into multiple display regions through patterned electrodes and corresponding transparent conductive oxide patterns on the substrate, rather than using physical partitioning walls. This segmentation approach maintains structural integrity while avoiding light leakage between regions.
2Illumination intensity
If reflective plates are added to improve display brightness, then illumination is enhanced, but device complexity increases
Solution Approach 1:
The patent utilizes the reflective properties of the flexible encapsulation layer itself to redirect light back through the display medium, eliminating the need for separate reflective plates. The encapsulation layer serves dual purposes: sealing the display medium and providing light reflection, thus reducing device complexity while maintaining brightness.
3Illumination intensity
If backlight module is used to enhance display in low light conditions, then visibility is improved, but power consumption increases
Solution Approach 1:
The patent employs adjustable brightness control where the backlight intensity can be dynamically adjusted based on ambient light conditions. The controller modulates the backlight output to provide sufficient visibility only when necessary, reducing power consumption in bright environments while maintaining visibility in low-light conditions.
Solution Approach 2:
The flexible encapsulation layer with integrated reflective function serves multiple purposes: sealing the display medium, reflecting light to enhance brightness, and working in conjunction with the adjustable backlight to provide visibility across various lighting conditions without requiring separate dedicated components.
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 improves display quality and reduces power consumption by allowing full light transmission, simplifying the design, and enhancing contrast, while maintaining flexibility and efficient operation in various lighting conditions.
Implementation Method 1
A electrophoretic display device, which comprises a plurality of charged particles controlled by a provided electric field
Implementation Method 2
a plurality of reflective plates, which are transparent materials disposed between the top substrate and the bottom substrate
Implementation Method 3
When charged particles of an electrophoretic display device are activated by an external electric field, they will move to the opposite direction relative to the electrode with opposite charges
Data Source
AI summary
A transflective electrophoretic display device is disclosed. The device is comprised of a transparent top substrate and both top and bottom substrates have an electrode structure. A plurality of separated walls and an electrophoretic display solution including a plurality of chromatic particles and a transparent liquid are imposed between the two substrates. A device with a display liquid or a filter plate is used to generate a variety of lights such as monochromatic, color-level or true color having a mixture of red, green and blue. The device of the present invention integrates the merits of the reflective and transmitted displayer, and can be used outdoors, indoors or in darkness. Otherwise, a back light module can compensate for the contrast of the displayer effectively.