Electronic Paper Light Guidance Unit Surface Unevenness

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Solution Overview

Problem

Existing electronic paper technologies suffer from surface unevenness and reduced reflectivity due to the presence of terminal areas, such as through-hole electrodes, which compromise image visibility.

Innovation Solution

An electronic paper configuration that includes a first substrate with electrodes, light receiving elements, a second substrate with a common electrode, and a light guidance unit between the substrates, allowing light to guide electricity between electrodes without the need for driving circuits like TFTs, thus eliminating the need for terminal areas and enhancing surface smoothness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminal areas (through-hole electrodes) are provided in the surface film side to enable voltage application, then electrical connection is achieved, but surface unevenness is generated and reflectivity is lowered

Engineering Contradiction:

Improveelectrical connectionVSAvoidreflectivity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent extracts and removes the terminal area (through-hole electrode) from the display surface side. By providing the through-hole electrode only on the rear surface side, the display surface becomes flat without protruding terminal areas, eliminating surface unevenness while maintaining electrical connection functionality through the rear-side electrode structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent moves the terminal area from the front display surface to the rear surface, changing the spatial dimension of electrode placement. This dimensional repositioning allows electrical connection to be maintained while the display surface remains flat and free of obstructive terminal structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If terminal areas (through-hole electrodes) are provided in the surface film side, then voltage application is enabled, but the microcapsule is partially shielded and image visibility is damaged

Engineering Contradiction:

Improvevoltage applicationVSAvoidimage visibility

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts the terminal area from the front display surface where it would shield microcapsules and block light. By relocating the through-hole electrode to the rear surface only, the microcapsules on the display surface are no longer partially shielded, ensuring full light transmission and optimal image visibility.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If through-hole electrodes are provided on the display surface side, then electrical connection is achieved, but unevenness is generated on the display surface

Engineering Contradiction:

Improveelectrical connectionVSAvoidsurface smoothness

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The patent removes the through-hole electrode structure from the display surface side, eliminating the source of surface unevenness. The electrical connection is maintained through a rear-side through-hole electrode configuration that does not protrude into the display surface, preserving surface smoothness.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This configuration reduces surface unevenness, increases image visibility, and allows for efficient switching and maintenance of pixel displays without power consumption, enabling high-quality image rendering.

Implementation Method 1

Each of the plurality of light receiving elements causes electricity to be conducted between each of the plurality of first electrodes and the wiring by detecting light led using the light guidance unit

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 2

it is possible to move a black particle group and a white particle group in the opposite direction in a microcapsule by applying voltage between the upper side through-hole electrodes and the lower side through-hole electrode

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Data Source

PatentUS9024933B2Electronic paper and electronic paper recording system using light receiving elements

Publication Date: 2015.05.05 E INK CORP

AI summary

An electronic paper includes: a first substrate which is provided with a plurality of first electrodes; a wiring which applies a voltage to the plurality of first electrodes; a plurality of light receiving elements which are respectively provided between the plurality of first electrodes and the wiring; a second substrate which is arranged to be opposite the first substrate and is provided with a second electrode; an electrophoretic display layer which is arranged between the first substrate and the second substrate; and a light guidance unit which is arranged between the first substrate and the second substrate, and is configured to guide light incident upon the second substrate to the relevant light receiving elements.