Ribbed Backplane Adhesive for Electro-Optic Displays
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Solution Overview
Problem
Electro-optic displays face issues with pixel blooming and non-imaging areas due to low resolution processes, leading to undesirable image quality and power consumption increases, particularly in high-resolution displays where the adhesive layer's conductivity affects voltage distribution and blooming effects.
Innovation Solution
A ribbed backplane design with inter-pixel regions having a lower dielectric constant and higher volume resistivity, along with controlled adhesive layer thickness and conductivity, and extended driving pulses to manage blooming and voltage distribution effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional adhesive layer with uniform dielectric constant and volume resistivity is used, then the manufacturing process is simple, but pixel blooming occurs and image quality deteriorates
Solution Approach 1:
The adhesive layer is divided into pixel regions and inter-pixel regions with different dielectric constants and volume resistivities. The inter-pixel regions have lower dielectric constant and higher volume resistivity to prevent voltage spread and reduce pixel blooming, while pixel regions maintain higher conductivity for proper pixel operation. This local differentiation resolves the contradiction by improving image quality through targeted property modification without requiring complete structural redesign.
Solution Approach 2:
The adhesive layer is segmented into functionally distinct pixel regions and inter-pixel regions. This segmentation allows independent optimization of electrical properties in each region, enabling the inter-pixel regions to act as electrical barriers while pixel regions maintain proper conductivity, thereby reducing blooming and improving image quality without excessive complexity.
2Use of energy by moving object
If the adhesive layer has high conductivity to reduce power consumption, then power efficiency improves, but pixel blooming increases and image quality worsens
Solution Approach 1:
The adhesive layer exhibits spatially varying conductivity: pixel regions have higher conductivity to reduce power consumption, while inter-pixel regions have lower conductivity (higher volume resistivity) to prevent blooming. This local quality differentiation allows the system to achieve both low power consumption and high image quality simultaneously by optimizing conductivity in each region for its specific function.
3Ease of manufacture
If low resolution processes are used to produce backplanes, then manufacturing cost decreases, but non-imaging areas appear between pixels and image quality deteriorates
Solution Approach 1:
The patent converts the harmful effect of gaps between pixels (caused by low resolution manufacturing) into a beneficial feature by filling these gaps with inter-pixel regions having specific electrical properties. These regions, which would otherwise be defects, are transformed into functional elements that prevent blooming and improve image quality, allowing low-cost manufacturing to achieve high-quality results.
Solution Approach 2:
The patent changes the electrical parameters (dielectric constant and volume resistivity) of the adhesive material in inter-pixel regions to compensate for manufacturing limitations. By adjusting these parameters, the system achieves proper voltage confinement and blooming control even when physical pixel spacing is increased due to low resolution processes, thereby maintaining image quality despite manufacturing constraints.
4Manufacturing precision
If extended driving pulses are used to control blooming, then image quality improves, but the duration of action increases and productivity decreases
Solution Approach 1:
The inter-pixel regions are pre-configured with lower dielectric constant and higher volume resistivity to establish electrical barriers before driving pulses are applied. This preliminary structural configuration prevents blooming from the outset, allowing the use of shorter driving pulses while maintaining image quality, thereby resolving the contradiction between image quality and productivity.
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 ribbed backplane design reduces pixel blooming, allows for higher conductivity adhesive layers without resolution loss, and achieves controlled blooming to cover gaps between pixels, enhancing image quality and power efficiency in high-resolution displays.
Implementation Method 1
the at least one inter-pixel region having at least one of a lower dielectric constant and a higher volume resistivity than the pixel regions of the adhesive layer
Implementation Method 2
the at least one inter-pixel region having at least one of a lower dielectric constant and a higher volume resistivity than the pixel regions of the adhesive layer
Implementation Method 3
controlled adhesive layer thickness and conductivity, and extended driving pulses to manage blooming and voltage distribution effectively
Data Source
AI summary
A backplane for an electro-optic display comprises a plurality of pixel electrodes, and an adhesive layer disposed adjacent the backplane, the adhesive layer comprising a plurality of pixel regions disposed adjacent the pixel electrodes of the backplane, and at least one inter-pixel region disposed between two pixels of the backplane, the at least one inter-pixel region having at least one of a lower dielectric constant and a higher volume resistivity than the pixel regions of the adhesive layer.