Electro-wetting Display Device White Brightness Control
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Solution Overview
Problem
Reflective type electro-wetting display devices face challenges in increasing white brightness without compromising color characteristics.
Innovation Solution
The device incorporates a polar fluid layer, non-polar black fluid layer, reflecting layer, and non-polar color fluid layer, with specific voltage control mechanisms to manage the movement of fluids and exposure of the reflecting layer, allowing for increased white brightness in a black and white mode while maintaining color accuracy in color mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the color fluid layer is present across the entire pixel area to display color images, then color characteristics are maintained, but white brightness is reduced because light must pass through the color fluid
Solution Approach 1:
The pixel area is segmented into two distinct regions: a first pixel region where the color fluid layer is present for color display, and a second pixel region where the color fluid layer is absent to maximize white brightness. This spatial segmentation allows each region to optimize for its specific function without compromising the other.
Solution Approach 2:
Different regions of the pixel area are assigned different optical properties: the first pixel region maintains color filtering capability while the second pixel region provides maximum light transmission for white display. This local differentiation of quality enables simultaneous optimization of color accuracy and white brightness in different areas.
2Illumination intensity
If voltage is applied to move the polar fluid layer to expose the reflecting layer for white display, then white brightness increases, but the color fluid distribution must be carefully controlled to maintain color mode functionality
Solution Approach 1:
The display device utilizes dynamic voltage control to switch between display modes. By applying different voltage levels to the driving electrode, the polar fluid layer can be dynamically repositioned to expose different areas of the reflecting layer, enabling transition between color and white display modes.
Solution Approach 2:
The voltage level applied to the driving electrode serves as a control parameter that determines the display mode. When the voltage level matches the first voltage applied to the polar fluid layer, color mode is activated. When the voltage level differs (off-voltage level), white mode is activated, causing the polar fluid to move and expose the reflecting layer.
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 white brightness in the black and white mode while preserving color accuracy in color mode, offering improved display performance without deteriorating color characteristics.
Implementation Method 1
A polar fluid layer, a pixel electrode, a non-polar black fluid layer, a reflecting layer, a driving electrode, and a non-polar color fluid layer are disposed in an electro-wetting display device
Implementation Method 2
The reflecting layer is between the black fluid and the first insulating substrate, and reflects an external incident light
Data Source
AI summary
An electro-wetting display device includes a polar fluid layer, a pixel electrode, a non-polar black fluid layer, a driving electrode, and a color fluid layer. The non-polar black fluid is deformed by a voltage difference between a voltage applied to the pixel electrode and a voltage applied to the polar fluid layer. the non-polar color fluid is deformed by a voltage difference between a voltage applied to the driving electrode and a voltage applied to the polar fluid layer. The driving electrode receives a voltage having a voltage level varied according to a display mode.