CN-122018215-A - Electrophoresis display screen

CN122018215ACN 122018215 ACN122018215 ACN 122018215ACN-122018215-A

Abstract

The application provides an electrophoretic display screen, which comprises a first substrate and an electrophoretic layer arranged on the first substrate, wherein a plurality of charged particles are arranged in the electrophoretic layer, a pixel electrode is arranged on the first substrate and is configured to enable the charged particles to gather on the first substrate or diffuse into the electrophoretic layer when voltage is applied, the pixel electrode comprises a plurality of pixel units which are repeatedly arranged, the pixel electrode forms a closed first pattern along the boundary of each pixel unit, a second pattern is formed inside the first pattern, and the first pattern and the second pattern are connected through a third pattern. By introducing the second pattern into the first pattern of the polygonal pixel electrode boundary, the aperture opening ratio of the pixel unit can be improved on the premise of meeting the existing design specification, so that the transmittance of the electrophoretic display screen is improved.

Inventors

XUE YANPENG
WANG LINZHI
LIN BAIQUAN

Assignees

上海天马微电子有限公司

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (10)

1. An electrophoretic display screen, comprising: A first substrate and an electrophoretic layer disposed thereon, the electrophoretic layer having a plurality of charged particles disposed therein; a pixel electrode disposed on the first substrate, the pixel electrode configured to be capable of causing the charged particles to be accumulated thereon or to be diffused into the electrophoretic layer when a voltage is applied; the pixel electrode comprises a plurality of pixel units which are repeatedly arranged, a closed first pattern is formed along the boundary of each pixel unit by the pixel electrode, a second pattern is formed inside the first pattern, and the first pattern and the second pattern are connected through a third pattern.
2. An electrophoretic display screen according to claim 1, wherein, The shape of the first pattern is regular hexagon.
3. An electrophoretic display screen according to claim 1 or 2, characterized in that, The shape of the second pattern is regular hexagon or circle.
4. An electrophoretic display screen according to claim 1 or 2, characterized in that, The inner edge of the first pattern is not more than 100 μm apart from the outer edge of the second pattern in the vertical direction, and The maximum inscribed circle diameter of the area surrounded by the second pattern is not more than 100 mu m.
5. An electrophoretic display screen according to claim 1 or 2, characterized in that, The pixel electrode comprises a first electrode layer and a second electrode layer which are overlapped; The first electrode layer is arranged above the second electrode layer and is electrically connected with the second electrode layer through a via hole.
6. An electrophoretic display screen according to claim 5, wherein, The first pattern, the second pattern, and the third pattern are simultaneously formed on the first electrode layer and the second electrode layer.
7. An electrophoretic display screen according to claim 5, wherein, The second pattern and the third pattern are formed on the second electrode layer, and the first pattern is formed on the first electrode layer and the second electrode layer at the same time.
8. An electrophoretic display screen according to claim 7, wherein, The first electrode layer is configured to adsorb the charged particles; the second electrode layer is configured to drive diffusion of the charged particles into the electrophoretic layer.
9. An electrophoretic display screen according to claim 2, wherein, The pixel electrode comprises a plurality of pixel areas, and each pixel area comprises a pixel unit positioned at the center and six pixel units surrounding the pixel unit; the connection positions of the third patterns and the first patterns of the six pixel units on the first patterns are distributed clockwise or anticlockwise.
10. An electrophoretic display screen according to claim 2, wherein, The pixel electrode comprises a plurality of pixel areas, and each pixel area comprises three adjacent pixel units; The connection position of the third pattern of each of the three pixel units and the first pattern corresponds to a common intersection point of the first patterns of the three pixel units.

Description

Electrophoresis display screen Technical Field The invention relates to the technical field of electronic paper display, in particular to an electrophoretic display screen. Background The electrophoretic display technology is widely applied to the fields of electronic readers, electronic tags, dimming glass and the like due to the characteristics of low power consumption, bistable state, paper-like display and the like. This technique uses electrophoresis to control the movement of charged ink particles in an electrophoretic fluid by applying a voltage across electrodes. When the voltage of the driving electrode is changed, the ink particles are uniformly diffused between the substrates, and the switching from the transparent state to the shading state is realized. In the existing electrode design of the electrophoretic display screen, in order to realize uniform driving of particles, a conventional electrode pattern design such as a checkerboard or a hexagonal grid is generally adopted. However, the Design of the electrode structure is limited by the Design Rule (Design Rule) of the drive and manufacture. In order to meet the requirement that the ink particles can be driven completely by the electric field without dead angles, the existing design specifications require that the distance between two adjacent electrode tracks cannot exceed a predetermined value. (e.g., a line spacing between the electrodes of no more than 100 μm). Under the limitation of the design specification, the aperture ratio of the checkerboard or single hexagon design of the traditional dense arrangement has reached the limit in consideration of the limit electrode line width (usually 10 μm) which can be realized by the process. Since it is necessary to rely on densely arranged grid lines to maintain a sufficiently small trace pitch, the opaque electrode lines occupy a large area in the overall panel. Therefore, in the conventional design, the aperture ratio is generally only about 80%, and cannot be further improved. This directly results in an electrophoretic dimming glass that has a low transmittance when it is in a transparent state and is not bright enough in a transparent state. Therefore, a new electrode structural design is needed, which can improve the aperture ratio of the ink electrode on the premise of being based on the existing design specification, so that the overall transmittance of the electrophoretic display screen can be improved, and the transparent state has higher brightness. Disclosure of Invention In order to solve the problems, the application provides an electrophoresis display screen, which comprises a first substrate and an electrophoresis layer arranged on the first substrate, wherein a plurality of charged particles are arranged in the electrophoresis layer; A pixel electrode disposed on the first substrate, the pixel electrode configured to be capable of accumulating charged particles thereon or diffusing into the electrophoretic layer when a voltage is applied; the pixel electrode comprises a plurality of pixel units which are repeatedly arranged, a closed first pattern is formed along the boundary of each pixel unit by the pixel electrode, a second pattern is formed inside the first pattern, and the first pattern and the second pattern are connected through a third pattern. Optionally, the shape of the first pattern is regular hexagon. Alternatively, the shape of the second pattern is regular hexagon or circle. Optionally, the inner edge of the first pattern is not more than 100 μm apart from the outer edge of the second pattern in the vertical direction, and The maximum inscribed circle diameter of the area surrounded by the second pattern is not more than 100 μm. Optionally, the pixel electrode includes a first electrode layer and a second electrode layer that are disposed in an overlapping manner; The first electrode layer is arranged above the second electrode layer and is electrically connected with the second electrode layer through a via hole. Alternatively, the first pattern, the second pattern, and the third pattern are simultaneously formed on the first electrode layer and the second electrode layer. Optionally, the second pattern and the third pattern are formed on the second electrode layer, and the first pattern is formed on both the first electrode layer and the second electrode layer. Optionally, the first electrode layer is configured to adsorb charged particles; the second electrode layer is configured to drive the diffusion of the charged particles into the electrophoretic layer. Optionally, the pixel electrode includes a plurality of pixel regions, each pixel region including a pixel unit located at a center and six pixel units surrounding the pixel unit; the connection positions of the third patterns and the first patterns of the six pixel units on the first patterns are distributed along the clockwise direction or the anticlockwise direction. Optionally, the pixel electrode inclu