Electrophoretic Display Device With RGBW Sub-Pixels
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Solution Overview
Problem
Conventional electrophoretic display devices can only display black-and-white images and suffer from low reflective luminance due to their reliance on external light, lacking the ability to display colors and requiring separate color filters.
Innovation Solution
Incorporating sub-pixels that exhibit red, green, blue, and white colors, along with a signal converter to convert three-color image signals into four-color signals, and a data driver to supply the converted signals as data voltage to the sub-pixels, enhancing reflective luminance and enabling color display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional EPD devices use only black-and-white particles, then manufacturing is simpler and cost is lower, but color display capability is lost and reflective luminance is reduced
Solution Approach 1:
The pixel is segmented into multiple sub-pixels, each containing particles of a specific color (red, green, blue, white). This segmentation allows each sub-pixel to be optimized for its specific function while collectively providing full color display capability and enhanced reflective luminance through the white sub-pixel's high reflectivity
Solution Approach 2:
The invention uses composite particle structures where each particle consists of a core material and a color layer material. The core provides structural integrity and electrophoretic properties, while the color layer provides the desired color. This composite approach enables both color display and high reflective luminance without requiring complex external color filters
2Adaptability or versatility
If separate color filters are added to achieve color display, then color capability is improved, but device complexity and production cost increase
Solution Approach 1:
The invention extracts and eliminates the separate color filter component from the display system. Instead of using external color filters, the color function is integrated directly into the electrophoretic particles themselves through the color layer material, thereby reducing device complexity and production cost while maintaining full color display capability
Solution Approach 2:
The electrophoretic particles serve multiple functions simultaneously: they provide the display medium for image formation, the color filtering function through their color layer material, and the reflective luminance function through the white particles. This multi-functionality eliminates the need for separate color filter components
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 solution improves reflective luminance by approximately 30% and allows for clear, distinct color image display without the need for external color filters, reducing power consumption and production costs.
Implementation Method 1
A voltage is applied to the two electrodes so that the charged particles move between the electrodes having opposite polarities, thereby displaying an image
Data Source
AI summary
An electrophoretic display device with an improved reflective luminance is presented. The electrophoretic display device includes an electrophoretic display panel including sub-pixels corresponding to four colors (e.g., red, green, blue, and white). A signal converter is provided for receiving an image signal for three colors and converting it into an image signal for four colors. A data driver is provided for supplying the converted image signal for four colors to the sub-pixels as a data voltage.