Electrowetting Display Substrate Reflection-Polarization Member Aperture Ratio
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Solution Overview
Problem
Current electrowetting display devices do not effectively utilize the entire area of a unit pixel for reflection or transmission, leading to suboptimal light handling and efficiency.
Innovation Solution
A display substrate with a reflection-polarization member, such as wire grids or a half mirror, is integrated into the electrowetting display panel to reflect and polarize incident light, allowing the entire unit pixel area to function as either a reflective or transmissive area, along with a switching element and pixel walls to manage light and liquid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrowetting display devices are used without a reflection-polarization member, then the device structure is simpler, but the aperture ratio and optical efficiency are reduced because the entire unit pixel area cannot be utilized for reflection or transmission
Solution Approach 1:
The patent combines multiple functions (reflection, polarization, and electrowetting control) into a single integrated reflection-polarization member. This member includes a reflection layer, polarization layer, and hydrophobic insulator layer that work together to enable the entire unit pixel area to function as either reflective or transmissive, thereby improving aperture ratio without proportionally increasing device complexity
Solution Approach 2:
The reflection-polarization member serves multiple functions simultaneously: it reflects incident light, polarizes the light, and acts as a hydrophobic insulator for the electrowetting effect. This multi-functionality allows the entire unit pixel area to be utilized effectively, improving optical efficiency while avoiding the need for separate components that would increase device complexity
2Use of energy by moving object
If the entire unit pixel area is used for reflection or transmission, then optical efficiency is improved, but the device requires additional components such as reflection-polarization members and pixel walls
Solution Approach 1:
The reflection-polarization member merges reflection, polarization, and electrowetting insulator functions into a single integrated component. This allows the entire unit pixel area to be used for light reflection or transmission, improving optical efficiency while minimizing the increase in device structure complexity
Solution Approach 2:
The hydrophobic insulator layer is applied selectively to specific regions where needed for the electrowetting effect, while the reflection and polarization functions are provided by the reflection-polarization member. This localized application of different properties allows optimal performance without unnecessary complexity throughout the entire device structure
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 enhances the aperture ratio and optical efficiency by enabling the entire unit pixel area to be used for reflection or transmission, improving light handling and reducing manufacturing costs.
Implementation Method 1
a reflection-polarization member disposed on the base substrate to reflect and polarize incident light
Implementation Method 2
a reflection-polarization member disposed on the base substrate to reflect and polarize incident light
Implementation Method 3
Surface characteristics of the hydrophobic insulator are controlled by applying a voltage to the electrode and the conductive liquid, when the conductive liquid and the non-conductive liquid contact each other on the coated hydrophobic insulator
Implementation Method 4
coating a hydrophobic insulator on an electrode and varying the contact angle of a conductive liquid
Implementation Method 5
The pixel wall is disposed on the insulation layer and defines the unit pixel area
Data Source
AI summary
A display substrate includes a base substrate, a reflection-polarization member, a first electrode, an insulation layer and a pixel wall. The reflection-polarization member is disposed on the base substrate to reflect and polarize incident light. The first electrode is disposed in a unit pixel area of the reflection-polarization member. The insulation layer is disposed on the first electrode. The pixel wall is disposed on the insulation layer and defines the unit pixel area. Therefore, the entire area of a unit pixel may be used as a reflective area or a transmissive area, and thus an aperture ratio may be improved in a reflection mode or a transmission mode.