Light Guide Plate Assembly with Electrophoretic Modulation
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Solution Overview
Problem
Conventional light guide plates in LCDs have regular scattering dots on their bottom surface, limiting partial light adjustment and making it difficult to enhance image contrast effectively.
Innovation Solution
A light guide plate assembly with transparent substrates and light modulation units containing electrophoretic capsules with oppositely charged white and black particles, allowing for dynamic light modulation by adjusting electric fields to control light scattering in various regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If regular scattering dots are formed on the bottom surface of the light guide plate, then the light guide plate can provide uniform backlight, but partial adjustment of light is not allowed and image contrast cannot be effectively increased
Solution Approach 1:
The patent applies electrophoretic capsules containing charged particles that can dynamically change their position and scattering properties in response to electric fields. This transforms the static regular scattering dots into dynamic light modulation units that can adaptively adjust light scattering characteristics, enabling partial dynamic light modulation while maintaining overall uniformity.
Solution Approach 2:
The patent divides the light guide plate into multiple independent light modulation units, each capable of independent light modulation. This allows different regions to have different light scattering characteristics, enabling localized light adjustment to improve image contrast while maintaining uniform backlight in other regions.
2Adaptability or versatility
If electrophoretic capsules with oppositely charged particles are used, then partial dynamic light modulation can be achieved, but device complexity increases
Solution Approach 1:
The patent utilizes changes in electrical parameters (voltage application to electrophoretic capsules) to control light modulation rather than mechanical adjustments. By changing the electrical state of the capsules, the system achieves dynamic light modulation with relatively simple structural components, managing the complexity through electrical control rather than mechanical complexity.
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
Enables partial dynamic light modulation and improved contrast in displayed images by flexibly adjusting light intensity in different regions, enhancing the display effect.
Implementation Method 1
an electrophoretic capsule layer which is positioned between the first electrode and the second electrode and comprises an electrophoretic capsule containing white electrophoretic particles and black electrophoretic particles which are dispersed in transparent dispersing medium and are oppositely charged
Data Source
AI summary
A light guide plate assembly comprising: a first substrate which is transparent and positioned on a light-emitting side of the light guide plate assembly; a second substrate which is disposed opposite to the first substrate; and a plurality of light modulation units which are disposed between the first substrate and the second substrate, wherein each of the light modulation units comprises: a first electrode which is disposed adjacent to the first substrate; a second electrode which is disposed adjacent to the second substrate, wherein the first electrode and the second electrode are configured to generate an electric field therebetween; and an electrophoretic capsule layer which is positioned between the first electrode and the second electrode and comprises an electrophoretic capsule containing white electrophoretic particles and black electrophoretic particles which are dispersed in transparent dispersing medium and are oppositely charged.