CN-122018212-A - Electrophoresis electronic paper display device

Abstract

The invention discloses an electrophoretic electronic paper display device which comprises a pixel layer, wherein the pixel layer comprises a plurality of microcapsules which are arranged in an array, each microcapsule is filled with an electrophoretic dispersion medium, positive charged particles and negative charged particles, each microcapsule is also filled with phase-change particles, each phase-change particle is provided with a liquid phase and a solid phase, when the temperature of the electrophoretic dispersion medium is lower than the phase-change temperature of the phase-change particles, the phase-change particles can be converted from the liquid phase to the solid phase and release heat, and when the temperature of the electrophoretic dispersion medium is higher than the phase-change temperature of the phase-change particles, the phase-change particles can be converted from the solid phase to the liquid phase and absorb heat. The electrophoretic electronic paper display device can temporarily maintain the response speed of the positively charged particles and the negatively charged particles in a low-temperature environment.

Inventors

• ZHANG LEI
• LIU FUZHI

Assignees

• 信利光电仁寿有限公司

Dates

Publication Date

20260512

Application Date

20260202

Claims (10)

1. 1. The electrophoretic electronic paper display device comprises a pixel layer, wherein the pixel layer comprises a plurality of microcapsules which are arrayed, an electrophoretic dispersion medium, positive charged particles and negative charged particles are filled in each microcapsule, and the electrophoretic electronic paper display device is characterized in that phase change particles are filled in each microcapsule, the phase change particles are provided with a liquid phase and a solid phase, when the temperature of the electrophoretic dispersion medium is lower than the phase change temperature of the phase change particles, the phase change particles can be converted from the liquid phase to the solid phase and release heat, and when the temperature of the electrophoretic dispersion medium is higher than the phase change temperature of the phase change particles, the phase change particles can be converted from the solid phase to the liquid phase and absorb heat.
2. 2. The electrophoretic electronic paper display device of claim 1, wherein the phase change particles are insoluble in the electrophoretic dispersion medium.
3. 3. The electrophoretic electronic paper display device of claim 1, wherein the phase change particles have a phase change temperature between 0 ℃ and 5 ℃.
4. 4. The electrophoretic electronic paper display device according to claim 1, wherein the particle size of the phase-change particles is between 0.5 μm and 5 μm.
5. 5. The electrophoretic electronic paper display device according to claim 1, wherein a mass ratio between the phase change particles and an electrophoretic system in the microcapsule is between 1:5 and 1:20.
6. 6. The electrophoretic electronic paper display device according to claim 1, wherein the phase-change particles are organic phase-change particles or inorganic phase-change particles modified by surface insulation coating.
7. 7. The electrophoretic electronic paper display device of claim 1, wherein one of the positively charged particles and negatively charged particles is a reflective particle and the other is a light absorbing particle.
8. 8. The electrophoretic electronic paper display device according to claim 1, further comprising an upper substrate, an upper electrode, a lower electrode, and a lower substrate, wherein the upper electrode is disposed on an upper surface of the pixel layer, the upper substrate is disposed on an upper surface of the upper electrode, the lower electrode is disposed on a lower surface of the pixel layer, the lower substrate is disposed on a lower surface of the lower electrode, and the upper electrode and the lower electrode together form a driving electric field for driving the positively charged particles and the negatively charged particles to float up and down in the electrophoretic dispersion medium.
9. 9. The electrophoretic electronic paper display device according to claim 1, wherein the lower electrode is a TFT array electrode, the upper electrode is a common electrode, and the TFT array electrode cooperates with the common electrode to apply a driving electric field to each microcapsule individually, thereby controlling each microcapsule individually to display.
10. 10. The electrophoretic electronic paper display device according to claim 1, wherein all microcapsules are divided into a plurality of pixel units, each pixel unit contains a plurality of microcapsules, the lower electrode is a TFT array electrode, the upper electrode is a common electrode, the TFT array electrode cooperates with the common electrode to apply a driving electric field to each pixel unit independently, and apply a driving electric field to all microcapsules in the same pixel unit simultaneously, so that each pixel unit is controlled independently to display, and all microcapsules in the same pixel unit are displayed simultaneously.

Description

Electrophoresis electronic paper display device Technical Field The present invention relates to electronic paper display technology, and more particularly, to an electrophoretic electronic paper display device. Background The electrophoresis electronic paper is a novel reflection type paper-like display technology based on electrophoresis phenomenon, wherein positive charged particles and negative charged particles in microcapsules are controlled to float up and down in an electrophoresis dispersion medium through an electric field, when the positive charged particles float up and the negative charged particles sink down, the positive charged particles reflect or absorb ambient light, when the negative charged particles float up and the positive charged particles sink down, the negative charged particles absorb or reflect the ambient light, so that the microcapsules are switched between a reflective state and a light absorption state. The electrophoretic electronic paper has bistable character, namely can be kept for a long time without continuous power supply after image formation, and only consumes electric energy when refreshing pictures, so that the power consumption is extremely low. However, the electrophoretic dispersion medium in the microcapsule is extremely sensitive to low temperature, and when the ambient temperature is low, the viscosity of the electrophoretic dispersion medium is increased, so that larger floating resistance is formed for the positively charged particles and the negatively charged particles, and the response speed of the positively charged particles and the negatively charged particles is reduced. Disclosure of Invention In order to solve the defects in the prior art, the invention provides an electrophoretic electronic paper display device, which can temporarily maintain the response speed of positive charged particles and negative charged particles in a low-temperature environment. The technical problems to be solved by the invention are realized by the following technical scheme: An electrophoretic electronic paper display device comprises a pixel layer, wherein the pixel layer comprises a plurality of microcapsules which are arrayed, an electrophoretic dispersion medium, positive charged particles and negative charged particles are filled in each microcapsule, phase change particles are filled in each microcapsule, each phase change particle is provided with a liquid phase and a solid phase, when the temperature of the electrophoretic dispersion medium is lower than the phase change temperature of the phase change particles, the phase change particles can be converted from the liquid phase to the solid phase and release heat, and when the temperature of the electrophoretic dispersion medium is higher than the phase change temperature of the phase change particles, the phase change particles can be converted from the solid phase to the liquid phase and absorb heat. Further, the phase change particles are insoluble in the electrophoretic dispersion medium. Further, the phase transition temperature of the phase transition particles is between 0 ℃ and 5 ℃. Further, the particle size of the phase change particles is 0.5-5 μm. Further, the mass ratio between the phase change particles and the electrophoresis system in the microcapsule is 1:5-1:20. Further, the phase change particles are organic phase change particles or inorganic phase change particles modified by surface insulation coating. Further, one of the positively charged particles and the negatively charged particles is a light reflecting particle, and the other is a light absorbing particle. Further, the electrophoretic electronic paper display device further comprises an upper substrate, an upper electrode, a lower electrode and a lower substrate, wherein the upper electrode is arranged on the upper side surface of the pixel layer, the upper substrate is arranged on the upper side surface of the upper electrode, the lower electrode is arranged on the lower side surface of the pixel layer, the lower substrate is arranged on the lower side surface of the lower electrode, and the upper electrode and the lower electrode jointly form a driving electric field for driving the positive charged particles and the negative charged particles to float up and down in the electrophoretic dispersion medium. Further, the lower electrode is a TFT array electrode, the upper electrode is a common electrode, and the TFT array electrode cooperates with the common electrode to apply a driving electric field to each microcapsule individually, so as to control each microcapsule individually to display. Furthermore, all the microcapsules are divided into a plurality of pixel units, each pixel unit comprises a plurality of microcapsules, the lower electrode is a TFT array electrode, the upper electrode is a common electrode, the TFT array electrode is matched with the common electrode to independently apply a driving electric field to each pix