Electrophoretic Display Substrate Inspection via Capacitor Lines
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Solution Overview
Problem
Inspecting a color filter on an electrophoretic display substrate without mounting a driver IC or flexible cable is challenging due to irregular coloring states caused by static electricity, making it difficult to maintain a constant voltage across all electrophoretic ink display elements.
Innovation Solution
An electrophoretic display substrate configuration with a capacitor element and a common electrode connected to capacitor element electrode lines, allowing a voltage to be applied to all sub pixel electrodes and electrophoretic display elements without a driver IC, enabling inspection through a color filter layer with predetermined wavelength discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driver IC and flexible cable are mounted on the TFT substrate to apply voltage to all electrophoretic ink display elements for inspection, then consistent coloration can be achieved, but the device complexity and manufacturing process become complicated
Solution Approach 1:
The patent extracts the voltage application function from the driver IC and flexible cable by utilizing the existing capacitor element electrode lines and common electrode lines that are already part of the TFT substrate structure. This eliminates the need for additional driver ICs and cables during inspection, resolving the contradiction between reliable voltage application and device complexity
Solution Approach 2:
The capacitor element electrode lines and common electrode lines, originally designed for their specific functions in the display operation, are made to serve a dual purpose by enabling voltage application for inspection of all electrophoretic ink display elements simultaneously. This multi-functionality approach allows consistent coloration without adding extra components
2Ease of manufacture
If the electrophoretic display substrate uses white and black display elements with a color filter added to achieve full color, then the manufacturing process remains simple, but the expressible color spectrum becomes narrower
Solution Approach 1:
The patent changes the parameter of the electrophoretic ink display elements themselves by incorporating colored particles (red, green, blue) directly into the display elements, rather than relying on external color filters. This parameter change in the display element composition enables a wider color spectrum while maintaining manufacturing simplicity through the same encapsulation process
3Adaptability or versatility
If display elements are arranged in sub pixel units with specific color particles to achieve high color purity, then the expressible color spectrum improves, but the manufacturing process becomes complicated
Solution Approach 1:
The patent merges the color filtering function and the display element function into a single integrated structure by incorporating colored particles directly within the electrophoretic ink display elements. This consolidation eliminates the need for separate sub pixel arrangements and external color filters, achieving high color purity while simplifying the manufacturing process
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 inspection of the color filter without additional components on the TFT substrate, ensuring consistent coloration across the electrophoretic ink display elements and improving the expressible color spectrum without complicating the existing process.
Implementation Method 1
an electrophoresis phenomenon in which colored particles are moved by applying a voltage to the charged colored particles due to an electrostatic attraction force
Implementation Method 2
a capacitor element including a first electrode and a second electrode
Implementation Method 3
a thin film transistor arranged on intersection points between each of the gate lines and each of the data lines
Data Source
Figure 1A
Figure 1B
Figure 1C~1D
AI summary
In an electrophoretic display substrate, an electrophoretic display layer includes a dispersion medium and an electrophoretic ink display element (15) which is charged, a first substrate (1) includes a gate line, a data line, a thin film transistor, a sub pixel electrode (10), a capacitor element (20) including first and second electrodes (8, 7), capacitor element electrode lines (3, 3A, 3B), and common electrode lines (4, 25), one of a source and drain terminals (12, 13) of the thin film transistor is connected to the data line, the other one of the source and drain terminals thereof is connected to the sub pixel electrode and the first electrode (8), the capacitor element electrode lines are connected to the second electrode (7), a common electrode (14) is formed on one surface of the second substrate (2) and a color filter layer is formed on the other surface, the common electrode is connected to the common electrode lines, and the color filter layer includes a transparent resin (6) which is laminated on the second substrate and color filter pixels (26, 27, 28, 29) which are formed on the resin.