# US 2025/0093731 A1 · Electrophoresis display with transparent control electrode

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- Number: US 2025/0093731 A1
- Document ID: US20250093731A1
- Status: Published application
- Kind: A1
- Application number: 18/816,440
- Filed: 2024-08-27
- Published: 2025-03-20
- Earliest claimed: 2023-09-14
- Assignees: Superc-Touch Corporation
- Applicants: Superc-Touch Corporation
- Inventors: Hsiang-Yu LEE; Shang CHIN; Ping-Tsun LIN; Chia-Cheng LEI; Kun-Yu CHEN
- Web page: https://patentgrep.com/patent/US20250093731A1

## CPC

- G02F 1/1676: Electrodes
- G02F 1/167: by electrophoresis
- G02F 1/16755: Substrates
- G02F 1/16766: for active matrices
- G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type
- G02F 1/1685: Operation of cells; Circuit arrangements affecting the entire cell
- G02F 2001/1678: {characterised by the composition or particle type}
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An electrophoresis display with transparent control electrode includes a transparent control substrate having a first face and a second face, a driving circuit layer, a control electrode layer having a plurality of transparent control electrodes, an electrophoresis layer, and an opposite substrate. The charges of the transparent control electrodes attract the charged color particles with opposite polarity to the charges of the transparent control electrodes toward a face of the electrophoresis layer near the control electrodes, thus forming image for viewer.

## Claims

### Claim 1

An electrophoretic display with a transparent control electrode, comprising:
a transparent control substrate, comprising a first face and a second face;
a driving circuit layer, arranged on the second face of the transparent control substrate and comprising: a plurality of thin film transistors, a plurality of gate lines, and a plurality of data lines, at least one of the gate lines electrically connected to the gates of the thin film transistors, at least one of the data lines electrically connected to the drains or sources of the thin film transistors;
a control electrode layer arranged on a side of the driving circuit layer away from the transparent control substrate and comprising: a plurality of transparent control electrodes, at least one of the transparent control electrodes electrically connected to the source or the drain of one of the thin film transistors;
an electrophoresis layer comprising an electrophoretic material, the electrophoretic material comprising a plurality of charged color particles, the charged color particles configured in a colloidal solution and moving through the colloidal solution under the influence of an electric field, the charged color particles comprising positively charged color particles and/or negatively charged color particles;
an opposite substrate arranged on a side of the electrophoresis layer away from the transparent control substrate;
wherein, charges on the transparent control electrodes attract the charged color particles with different charge polarities to accumulate on a surface of the electrophoresis layer close to the transparent control electrodes to form an image seen by a viewer.

### Claim 2 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein the driving circuit layer further comprises a plurality of storage capacitors, at least the storage capacitor in a viewing area of the electrophoretic display comprises a first electrode which is transparent, a second electrode which is transparent, and an insulation layer between the first electrode and the second electrode.

### Claim 3 (depends on 2)

The electrophoretic display with the transparent control electrode of claim 2, wherein the first electrode and the second electrode of the storage capacitor overlap each other in a projection direction, and their overlapping area is not less than 30% of a pixel area.

### Claim 4 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, further comprising: a color filter layer disposed on the transparent control substrate.

### Claim 5 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, an overlapping area of the thin film transistor and the gate line is not less than 20 μm2.

### Claim 6 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, an overlapping area of the thin film transistor and the data line is not less than 5 μm2.

### Claim 7 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, along a direction looking from the first face of the transparent control substrate into a display region of the electrophoretic display, an aperture ratio of the control substrate of the electrophoretic display is not less than 70%.

### Claim 8 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, along a direction looking from the first face of the transparent control substrate into a display region of the electrophoretic display, an aperture ratio of the control substrate of the electrophoretic display is not less than 80%.

### Claim 9 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, along a direction looking from the first face of the transparent control substrate into a display region of the electrophoretic display, an aperture ratio of the control substrate of the electrophoretic display is not less than 90%.

### Claim 10 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, a line width of the gate line is not more than 10 μm.

### Claim 11 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, a line width of the data line is not more than 10 μm.

### Claim 12 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, a line width of the gate line is not more than 5 μm.

### Claim 13 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, a line width of the data line is not more than 5 μm.

### Claim 14 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, the sum of a line width of the gate line and a line width of the data line are not more than 20 μm.

### Claim 15 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, an area of a semiconductor part of the thin film transistor is not more than 1000 μm2.

### Claim 16 (depends on 2)

The electrophoretic display with the transparent control electrode of claim 2, wherein, the first electrode is the control electrode and the second electrode is arranged on a first transparent conductive layer.

### Claim 17 (depends on 16)

The electrophoretic display with the transparent control electrode of claim 16, further comprising:
a common voltage line, electrically connected to the first transparent conductive layer and substantially parallel to one of the gate lines of the driving circuit layer.

### Claim 18 (depends on 17)

The electrophoretic display with the transparent control electrode of claim 17, wherein, the gate lines are partially made of a transparent conductive material, or the data lines are partially made of a transparent conductive material.

### Claim 19 (depends on 2)

The electrophoretic display with the transparent control electrode of claim 2, wherein, the driving circuit layer further comprises:
a flat layer, the first electrode is the control electrode, the second electrode arranged on a first transparent conductive layer, and the first transparent conductive layer arranged above the flat layer.

### Claim 20 (depends on 19)

The electrophoretic display with the transparent control electrode of claim 19, further comprising:
a common voltage line, electrically connected to the first transparent conductive layer and substantially parallel to one of the data lines of the driving circuit layer.

### Claim 21 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, a common electrode layer is disposed on the opposite substrate, the common electrode layer is an opaque conductive material.

### Claim 22 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, the electrophoresis layer comprises a plurality of micro-partition structures made of polymer materials, the micro-partition structures comprise a plurality of partition walls to define a chamber configured to fill with the electrophoresis material.

### Claim 23 (depends on 22)

The electrophoretic display with the transparent control electrode of claim 22, further comprising:
a plurality of micro tenons, each of the micro tenons embedded in one of the chambers.

### Claim 24 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, further comprising:
a color filter layer, between the transparent control substrate and the electrophoresis layer.

### Claim 25 (depends on 1)

The electrophoretic display with the transparent control electrode of claim 1, wherein, the driving circuit layer, further comprising:
a plurality of storage capacitors and a plurality of common voltage lines, the common voltage lines respectively disposed corresponding to the storage capacitors and substantially parallel to the gate lines, the common voltage lines electrically connected to a display touch integrated driver.

### Claim 26 (depends on 25)

The electrophoretic display with the transparent control electrode of claim 25, wherein, during a touch operation of the electrophoretic display, the display touch integrated driver electrically connects a plurality of data lines together as a single touch-transmitting electrode; the display touch integrated driver electrically connects a plurality of common voltage lines together as a single touch-receiving electrode.

### Claim 27 (depends on 25)

The electrophoretic display with the transparent control electrode of claim 25, during a touch operation of the electrophoretic display, the display touch integrated driver electrically connects a plurality of data lines together as a single touch-receiving electrode; the display touch integrated driver electrically connects a plurality of common voltage lines together as a single touch-transmitting electrode.

### Claim 28 (depends on 4)

The electrophoretic display with the transparent control electrode of claim 4, wherein, the color filter layer comprises a plurality of color filter blocks with different colors, at least one of the color filter blocks comprises a plurality of holes, and an area of at least one of the holes is not more than 100 μm2.

### Claim 29 (depends on 2)

The electrophoretic display with the transparent control electrode of claim 2, wherein, the first electrode and the second electrode are between a semiconductor part of the thin film transistor and the electrophoresis layer.