Electrophoretic Display With Integrated PLED Illumination
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Solution Overview
Problem
Conventional electrophoretic display devices struggle with clear image display in low ambient light environments due to the need for external light sources, which can cause issues like bubble formation, attaching stress, and non-uniform illumination, especially in large-sized displays.
Innovation Solution
Incorporating a polymer light emitting diode (PLED) module aligned with the electrophoretic display module, utilizing a waterproof layer and sealant to attach the PLED module, and optionally including a color filter layer for improved illumination, allowing the device to operate self-luminously and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a front-light source with LED and light guide plate is used to illuminate the electrophoretic display device, then the display can be seen in low ambient light, but the device thickness increases and uniform illumination is difficult to achieve
Solution Approach 1:
The patent merges the light source function directly into the electrophoretic display module by integrating a light-emitting layer between the substrate and the electrophoretic medium. This eliminates the need for separate LED and light guide plate components, achieving thin-form-factor illumination while providing uniform light distribution across the display area.
Solution Approach 2:
The patent extracts the illumination function from conventional external components (LED and light guide plate) and embeds it directly within the display module structure. This extraction allows the light source to be positioned at the optimal location for thin-profile applications while maintaining uniform illumination.
2Illumination intensity
If a front-light source with LED and light guide plate is used, then illumination is provided, but bubbles and attaching stress occur at the interface due to adhesive attachment
Solution Approach 1:
The patent combines the light-emitting components with the display substrate into a single integrated module, eliminating the adhesive interface between separate components. This integration removes the source of bubbles and attaching stress while maintaining structural reliability.
Solution Approach 2:
The patent uses a transparent substrate as an intermediary layer that integrates the light-emitting function with the display structure. This intermediary approach allows uniform light transmission while maintaining strong structural bonding without requiring additional adhesives.
3Illumination intensity
If conventional LED and light guide plate are used, then light is provided, but the thickness of the electrophoretic display device cannot be reduced
Solution Approach 1:
The patent merges multiple functions (substrate, light source, and electrophoretic medium containment) into a single integrated module structure. This consolidation eliminates the need for separate LED and light guide plate layers, achieving thin-form-factor illumination without increasing device thickness.
Solution Approach 2:
The patent transitions from a conventional stacked architecture (LED below, light guide plate in middle, display on top) to an integrated planar structure where the light-emitting layer is embedded within the display module plane. This dimensional reorganization enables thin-profile design while maintaining illumination function.
4Illumination intensity
If an additional light source is used, then illumination is provided, but it is quite inconvenient to use
Solution Approach 1:
The patent merges the light source control with the display control system, allowing the illumination to be automatically activated when needed. This integration eliminates the need for separate manual operation of the light source, improving ease of use while maintaining the ability to provide illumination in low ambient light conditions.
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 PLED module provides uniform illumination and reduces the thickness of the electrophoretic display device, enabling clear image display without external light sources, especially in low ambient conditions, while maintaining energy efficiency by turning off in bright environments.
Implementation Method 1
a polymer light emitting diode (PLED) module, wherein the polymer light emitting diode module is over the electrophoretic display module, and is aligned with and attached to the electrophoretic display module
Implementation Method 2
Since the electrophoretic display device is a reflective display device, the electrophoretic display device itself does not emit light, and it relies on external light source
Data Source
AI summary
An electrophoretic display device includes an electrophoretic display module, and a polymer light emitting diode (PLED) module. The polymer light emitting diode (PLED) module is over the electrophoretic display module, and is aligned with and is attached to the electrophoretic display module. In a dark environment, the polymer light emitting diode (PLED) module can emit light to supplement the insufficient ambient light, so that the users may observe the information or pattern displayed by the electrophoretic display device. The electrophoretic display device can be a flexible electrophoretic display device.