Electronic paper display device

Abstract

The present invention discloses an electronic paper display device, which relates to the field of display technology, and includes a first array substrate and a second array substrate arranged opposite to each other, a photoluminescent layer, a one-way light-transmitting layer and a microcapsule structure layer, wherein the first array substrate is provided with a plurality of pixel units arranged in an array, the one-way light-transmitting layer includes a plurality of first one-way light-transmitting portions and second one-way light-transmitting portions arranged alternately and in opposite light-transmitting directions, and two adjacent first one-way light-transmitting portions and second one-way light-transmitting portions are arranged corresponding to one pixel unit; the microcapsule structure layer includes a plurality of microcapsules corresponding to the plurality of pixel units, and the microcapsules cover at least a portion of the surface of the first one-way light-transmitting portion and at least a portion of the surface of the second one-way light-transmitting portion; the microcapsules include a plurality of black charged particles, and the black charged particles can move under the action of the electric field of the first array substrate and the second array substrate to control the display brightness of the corresponding pixel unit. The present invention can improve the display brightness and can be used in a strong light environment.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an electronic paper display device. Background Art

[0002] Electronic paper, also known as digital paper, is an ultra-thin and ultra-light display screen with the advantages of bistable operation, reflective display, environmental protection and energy saving, eye protection, lightness and portability. It is widely used in electronic price tags, education, advertising, personal electronic products and other fields. Electronic paper technology is a microcapsule electrophoresis display technology. The microcapsule contains charged nanoparticles suspended in a liquid. The basic principle is that charged nanoparticles migrate under the action of an electric field. However, the display brightness of electronic paper display devices is relatively poor at present, and it is not suitable for use in strong light environments. Summary of the invention

[0003] The main purpose of the present invention is to provide an electronic paper display device, aiming to improve the display brightness of the electronic paper display device so that it can be used in a strong light environment.

[0004] To achieve the above object, the present invention provides an electronic paper display device, comprising:

[0005] A first array substrate and a second array substrate are arranged opposite to each other, wherein the first array substrate is provided with a plurality of pixel units arranged in an array;

[0006] A photoluminescent layer is provided on a surface of the first array substrate facing the second array substrate;

[0007] a one-way light-transmitting layer, arranged on a surface of the photoluminescent layer facing away from the first array substrate, the one-way light-transmitting layer comprising a plurality of first one-way light-transmitting portions and second one-way light-transmitting portions which are alternately arranged and have opposite light-transmitting directions, wherein two adjacent first one-way light-transmitting portions and the second one-way light-transmitting portions are arranged corresponding to one pixel unit;

[0008] a microcapsule structure layer, disposed between the one-way light-transmitting layer and the second array substrate, the microcapsule structure layer comprising a plurality of microcapsules, one microcapsule being disposed corresponding to one pixel unit and covering at least a portion of a surface corresponding to the first one-way light-transmitting portion and at least a portion of a surface corresponding to the second one-way light-transmitting portion;

[0009] The microcapsule includes a plurality of black charged particles, and the black charged particles can move under the action of the electric field of the first array substrate and the second array substrate to control the display brightness of the corresponding pixel unit.

[0010] In one embodiment, the light transmission direction of the first one-way light-transmitting portion is from the one-way light-transmitting layer to the photoluminescent layer, and the light transmission direction of the second one-way light-transmitting portion is from the photoluminescent layer to the one-way light-transmitting layer;

[0011] When the black charged particles move to be opposite to the first one-way light-transmitting portion under the action of the electric field of the first array substrate and the second array substrate, the display state of the corresponding pixel unit is a white state;

[0012] When the black charged particles move to be opposite to the second one-way light-transmitting portion under the action of the electric field of the first array substrate and the second array substrate, the display state of the corresponding pixel unit is a black state.

[0013] In one embodiment, the microcapsules cover the entire second one-way light-transmitting portion and cover at least a portion of the first one-way light-transmitting portion; when the display state of the pixel unit is black, the black charged particles cover the entire second one-way light-transmitting portion.

[0014] In one embodiment, the microcapsule is a rectangular parallelepiped structure, and in the extension direction of the first array substrate surface, the size of the microcapsule is 0.7-0.8 times the size of the corresponding pixel unit;

[0015] The volume of the black charged particles is 0.5-0.8 times the volume of the microcapsule.

[0016] In one embodiment, the black charged particles carry positive charges, and under the action of the positive electric field generated by the first array substrate and the second array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to be opposite to the first one-way light-transmitting portion, so that the display state of the corresponding pixel unit is a white state;

[0017] Under the action of the positive electric field generated by the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the black charged particles move to be opposite to the second one-way light-transmitting portion, so that the display state of the corresponding pixel unit is black.

[0018] In one embodiment, under the action of the positive electric field generated by the portions of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, and the positive electric field generated by the portion of the second array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to the second one-way light-transmitting portion opposite to and close to the second one-way light-transmitting portion, so that the display state of the corresponding pixel unit is a black state; or,

[0019] Under the action of the positive electric field generated by the parts of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, and the positive electric field generated by the part of the first array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to the second one-way light-transmitting portion opposite to and away from the second one-way light-transmitting portion, so that the display state corresponding to the pixel unit is black.

[0020] In one embodiment, the black charged particles carry positive charges, and under the action of a positive electric field generated by portions of the first array substrate and the second array substrate corresponding to the second one-way light-transmitting portion and a negative electric field generated by portions of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the black charged particles move to be opposite to the first one-way light-transmitting portion, so that the display state of the corresponding pixel unit is a white state;

[0021] Under the action of the positive electric field generated by the parts of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the positive electric field generated by the part of the second array substrate corresponding to the second one-way light-transmitting portion, and the negative electric field generated by the part of the first array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to a position opposite to and close to the second one-way light-transmitting portion, so that the display state corresponding to the pixel unit is black.

[0022] In one embodiment, the microcapsule includes a first microcapsule portion and a second microcapsule portion which are vertically connected, the first microcapsule portion extends in a direction parallel to the surface of the first array substrate, and the second microcapsule portion extends in a direction perpendicular to the surface of the first array substrate and toward the one-way light-transmitting layer;

[0023] The first microcapsule portion covers the entire second one-way light-transmitting portion, and the second microcapsule portion covers a portion of the first one-way light-transmitting portion;

[0024] The size of the first microcapsule portion in a direction parallel to the first array substrate surface is not smaller than the size of the second microcapsule portion in a direction perpendicular to the first array substrate surface, and the volume of the black charged particles is the same as that of the second microcapsule portion.

[0025] In one embodiment, in the extension direction of the first array substrate, the size of the first one-way light-transmitting portion is the same as the size of the second one-way light-transmitting portion, and the size of the first one-way light-transmitting portion accounts for 1 / 2 of the size of the corresponding pixel unit; and / or,

[0026] The one-way light-transmitting layer is a polyester film or a polycarbonate film, and the thickness of the one-way light-transmitting layer is 1-2 μm; and / or,

[0027] The material of the photoluminescent layer is a long afterglow luminescent material, and the thickness of the photoluminescent layer is 1-2 μm.

[0028] In one embodiment, the first array substrate and the second array substrate both include a base substrate and a thin film transistor circuit layer, the base substrate is provided with a plurality of the pixel units, and the thin film transistor circuit layer is provided on the base substrate to generate a positive electric field or a negative electric field; and / or,

[0029] The electronic paper display device further comprises two insulating protective layers, which are respectively arranged on a surface of the first array substrate facing the photoluminescent layer and a surface of the second array substrate facing the microcapsule structure layer.

[0030] According to the technical solution of the present invention, an electronic paper display device comprises a first array substrate and a second array substrate which are arranged opposite to each other, a photoluminescent layer, a one-way light-transmitting layer and a microcapsule structure layer, wherein the first array substrate is provided with a plurality of pixel units arranged in an array, the photoluminescent layer is arranged on a surface of the first array substrate facing the second array substrate; the one-way light-transmitting layer is arranged on a surface of the photoluminescent layer facing away from the first array substrate, the one-way light-transmitting layer comprises a plurality of first one-way light-transmitting portions and second one-way light-transmitting portions which are alternately arranged and have opposite light-transmitting directions, and two adjacent first one-way light-transmitting portions and second one-way light-transmitting portions are arranged corresponding to one pixel unit; the microcapsule structure layer is arranged between the one-way light-transmitting layer and the second array substrate, the microcapsule structure layer comprises a plurality of microcapsules, one microcapsule is arranged corresponding to one pixel unit, and covers at least a portion of the surface of the corresponding first one-way light-transmitting portion and at least a portion of the surface of the second one-way light-transmitting portion; the microcapsules comprise a plurality of black charged particles, and the black charged particles can move under the action of the electric field of the first array substrate and the second array substrate to control the display brightness of the corresponding pixel unit. The present invention uses microcapsule display technology, adds a photoluminescent layer and a one-way light-transmitting layer, and the photoluminescent layer can be excited by external ambient light to form a backlight source. In combination with the design of the one-way light-transmitting layer, the movement of black charged particles under the electric field of the first array substrate and the second array substrate is used to control the display brightness of the pixel unit, forming a black and white display screen, and its display brightness can be effectively improved, and it can be used in a strong light environment. In addition, the electronic paper display device of the present invention has a simple structure and is easy to realize a black and white display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 A schematic cross-sectional structure diagram of an embodiment of an electronic paper display device provided by the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of a cross-sectional structure of an electronic paper display device in a white state;

[0034] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of an electronic paper display device in a black state;

[0035] Figure 4 A schematic cross-sectional structure diagram of another embodiment of the electronic paper display device provided by the present invention in a black state;

[0036] Figure 5 A schematic cross-sectional structure diagram of another embodiment of the electronic paper display device provided by the present invention in a white state;

[0037] Figure 6 The present invention is a schematic cross-sectional structural diagram of another embodiment of the electronic paper display device in white state and black state.

[0038] Description of Figure Numbers:

[0039] 100. Electronic paper display device; 10. First array substrate; 20. Second array substrate; 1. Base substrate; 2. Thin film transistor circuit layer; 3. Insulating protection layer; 4. Photoluminescent layer; 5. One-way light-transmitting layer; 51. First one-way light-transmitting portion; 52. Second one-way light-transmitting portion; 6. Microcapsule structure layer; 61. Microcapsule; 611. First microcapsule portion; 612. Second microcapsule portion; 62. Black charged particles.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention provides an electronic paper display device 100, which aims to improve the display brightness of the electronic paper display device 100 so that it can be used in a strong light environment.

[0045] See also Figure 1 In one embodiment of the present invention, the electronic paper display device 100 includes a first array substrate 10 and a second array substrate 20 arranged opposite to each other, a photoluminescent layer 4, a one-way light-transmitting layer 5 and a microcapsule structure layer 6, wherein the first array substrate 10 is provided with a plurality of pixel units arranged in an array, the photoluminescent layer 4 is arranged on the opposite surface of the first array substrate 10; the one-way light-transmitting layer 5 is arranged on the surface of the photoluminescent layer 4 facing away from the first array substrate 10, the one-way light-transmitting layer 5 includes a plurality of first one-way light-transmitting portions 51 and second one-way light-transmitting portions 52 arranged alternately and having opposite light-transmitting directions, and two adjacent first one-way light-transmitting portions 51 and 52 are arranged opposite to each other in light-transmitting directions. 51 and the second one-way light-transmitting portion 52 are arranged corresponding to a pixel unit; the microcapsule structure layer 6 is arranged between the one-way light-transmitting layer 5 and the second array substrate 20, and the microcapsule structure layer 6 includes a plurality of microcapsules 61, one microcapsule 61 is arranged corresponding to one pixel unit, and covers at least part of the surface of the first one-way light-transmitting portion 51 and at least part of the surface of the second one-way light-transmitting portion 52; the microcapsule 61 includes a plurality of black charged particles 62, and the black charged particles 62 can move under the action of the electric field of the first array substrate 10 and the second array substrate 20 to control the display brightness of the corresponding pixel unit.

[0046] Specifically, the first array substrate 10 has a plurality of pixel units arranged in an array, and correspondingly, the second array substrate 20 has a plurality of pixel units arranged in an array. Both the first array substrate 10 and the second array substrate 20 can be selected as metal thin film transistor array substrates, and the metal thin film transistor array substrate has a metal thin film transistor circuit pattern inside, and the metal thin film transistor circuit pattern can generate a positive electric field or a negative electric field under the control of a driving IC. The photoluminescent layer 4 is made of a photoluminescent material, has the performance of absorbing light and exciting luminescent materials, and can use external ambient light to excite and form a backlight source; the one-way light-transmitting layer 5 refers to a layer that only allows light to be transmitted in one direction, that is, it only allows light to be transmitted from one side to the other side. The material and structure of the one-way light-transmitting layer 5 are not limited here, as long as it can achieve one-way light transmission. The one-way light transmission directions of the first one-way light transmission part 51 and the second one-way light transmission part 52 are opposite and arranged alternately. The adjacent first one-way light transmission part 51 and the second one-way light transmission part 52 are arranged corresponding to one pixel unit, that is, in the extension direction of the board surface of the first array substrate 10, the sum of the sizes of the adjacent first one-way light transmission part 51 and the second one-way light transmission part 52 is equal to the size of one pixel unit, and the adjacent first one-way light transmission part 51 and the second one-way light transmission part 52 completely cover the entire pixel unit. One of the adjacent first one-way light transmission part 51 and the second one-way light transmission part 52 is a light inlet channel, that is, only allows light to be transmitted in one direction from the one-way light transmission layer 5 to the direction of the photoluminescent layer 4, and the light is absorbed by the photoluminescent layer 4 after the one-way transmission, and the other of the adjacent first one-way light transmission part 51 and the second one-way light transmission part 52 is a light outlet channel, that is, the photoluminescent layer 4 emits light and only allows light to be transmitted in one direction from the photoluminescent layer 4 to the direction of the one-way light transmission layer 5. The microcapsule structure layer 6 is located between the one-way light-transmitting layer 5 and the second array substrate 20. The microcapsule structure layer 6 is composed of a plurality of microcapsules 61 arranged at intervals. One microcapsule 61 is arranged corresponding to one pixel unit. The microcapsule 61 can be located in the middle, left or right part of the corresponding pixel unit, and the specific position is not limited. In the extension direction of the first array substrate 10, the size of the microcapsule 61 is larger than the size of the first one-way light-transmitting part 51 or the second one-way light-transmitting part 52. In this way, no matter how the microcapsule 61 is arranged, it can cover at least part of the surface of the first one-way light-transmitting part 51 and at least part of the surface of the second one-way light-transmitting part 52. The shape of the microcapsule 61 can be a cube, a sphere, a prism, a right angle or other reasonable shape, as long as it can cover at least part of the surface of the first one-way light-transmitting part 51 and at least part of the surface of the second one-way light-transmitting part 52.The microcapsule 61 includes a solution disposed inside and black charged particles 62 suspended in the solution. The solution may be an insulating dispersed liquid, such as a hydrocarbon solution. The black charged particles 62 are nanoparticles with strong light absorption capability, which is determined by the electronic structure and energy level distribution of the black charged nanoparticles. When light is irradiated onto these particles, the energy of the photons is absorbed by the black charged particles 62, so that the light cannot be transmitted, achieving a light shielding effect, so that the electronic paper display device 100 realizes a black state display. The material of the black charged nanoparticles may be carbon nanotubes, graphene, or black metal oxides. The black charged nanoparticles may be positively or negatively charged, and their electrical properties (including) are determined by their surface modification. When the black charged particles 62 move under the action of the electric field of the first array substrate 10 and the second array substrate 20 and move to cover the light inlet channel, the black charged particles 62 do not affect the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a white state; when the black charged particles 62 move under the action of the electric field of the first array substrate 10 and the second array substrate 20 and move to cover the light outlet channel, the black charged particles 62 block the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a black state. In this way, the black and white state control of the pixel unit realizes the black and white display of the electronic paper display device 100, and the display brightness is significantly improved.

[0047] It should be noted that the electrical properties of the black charged particles 62 and the positive and negative electric fields of the first array substrate 10 and the second array substrate 20 are not limited, as long as the above-mentioned black and white state control can be achieved.

[0048] The present invention uses the display technology of microcapsules 61, adds a photoluminescent layer 4 and a one-way light-transmitting layer 5, and the photoluminescent layer 4 can be excited by external ambient light to form a backlight source. In combination with the design of the one-way light-transmitting layer 5, the movement of black charged particles 62 under the electric field of the first array substrate 10 and the second array substrate 20 is used to control the display brightness of the pixel unit, forming a black and white display screen, and its display brightness can be effectively improved, and it can be used in a strong light environment. In addition, the electronic paper display device 100 of the present invention has a simple structure and is easy to realize a black and white display screen.

[0049] In some embodiments of the present invention, in the extension direction of the first array substrate 10, the size of the first one-way light-transmitting portion 51 is the same as the size of the second one-way light-transmitting portion 52, and the size of the first one-way light-transmitting portion 51 is 1 / 2 of the size of the corresponding pixel unit. Such a design can facilitate the batch production of the first one-way light-transmitting portion 51 and the second one-way light-transmitting portion 52, and is conducive to the black and white display design of the pixel unit.

[0050] In some embodiments of the present invention, the one-way light-transmitting layer 5 is a polyester film or a polycarbonate film, that is, the first one-way light-transmitting portion 51 and the second one-way light-transmitting portion 52 are both one-way light-transmitting films, which can be polyester films or polycarbonate films. The one-way light-transmitting film has a special optical structure, which can reflect light in a specific direction and refract it in other directions. In this way, light incident from one direction can be reflected, while light incident from another direction can pass through the film, achieving a one-way light-transmitting effect. The one-way light-transmitting film is an existing film and can be purchased. The first one-way light-transmitting portion 51 and the second one-way light-transmitting portion 52 can be films of the same material. When mounting, mounting in one direction can achieve the opposite light transmission directions of the two.

[0051] Optionally, the thickness of the one-way light-transmitting layer 5 (including the first one-way light-transmitting portion 51 and the second one-way light-transmitting portion 52) is 1-2μm (for example, 1μm, 1.2μm, 1.5μm, 1.8μm, 2μm and an interval value between any two end points). Such a design can achieve the effect of one-way light transmission and also reduce the overall thickness of the electronic paper display device 100 to a certain extent.

[0052] In one embodiment of the present invention, the light transmission direction of the first one-way light transmitting portion 51 is from the one-way light transmitting layer 5 to the photoluminescent layer 4, and the light transmission direction of the second one-way light transmitting portion 52 is from the photoluminescent layer 4 to the one-way light transmitting layer 5; when the black charged particles 62 move to be opposite to the first one-way light transmitting portion 51 under the action of the electric field of the first array substrate 10 and the second array substrate 20, the display state of the corresponding pixel unit is a white state; when the black charged particles 62 move to be opposite to the second one-way light transmitting portion 52 under the action of the electric field of the first array substrate 10 and the second array substrate 20, the display state of the corresponding pixel unit is a black state.

[0053] In this embodiment, the first one-way light-transmitting portion 51 is a light-incoming channel, which only allows light to pass through the first one-way light-transmitting portion 51 in a direction close to the photoluminescent layer 4, and the light is absorbed by the photoluminescent layer 4 after the one-way transmission; the second one-way light-transmitting portion 52 is a light-exiting channel, which emits light from the photoluminescent layer 4 and only allows light to pass through the second one-way light-transmitting portion 52 in a direction away from the photoluminescent layer 4. Under the action of the electric field of the first array substrate 10 and the second array substrate 20, when the black charged particles move to be opposite to the first one-way light-transmitting portion 51 (i.e., the light-incoming channel), the black charged particles 62 do not affect the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a white state; under the action of the electric field of the first array substrate 10 and the second array substrate 20, when the black charged particles move to be opposite to the second one-way light-transmitting portion 52 (i.e., the light-exiting channel), the black charged particles 62 block the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a black state.

[0054] Of course, in some other embodiments, the first one-way light-transmitting portion 51 may be a light-emitting channel, and the second one-way light-transmitting portion 52 may be a light-incoming channel.

[0055] See also Figure 1 In one embodiment of the present invention, the microcapsules 61 cover the entire second one-way light-transmitting portion 52 and cover at least a portion of the first one-way light-transmitting portion 51 ; when the display state of the pixel unit is a black state, the black charged particles 62 cover the entire second one-way light-transmitting portion 52 .

[0056] In this embodiment, in the extension direction of the first array substrate 10, the size of the microcapsule 61 is larger than the size of the second one-way light-transmitting portion 52, and the side of the microcapsule 61 close to the second one-way light-transmitting portion 52 is flush with the side of the second one-way light-transmitting portion 52 away from the first one-way light-transmitting portion 51, so that the microcapsule 61 can cover all of the second one-way light-transmitting portion 52 and at least part of the first one-way light-transmitting portion 51, and when the display state of the pixel unit is black, the black charged particles 62 cover all of the second one-way light-transmitting portion 52. Such a design can ensure that the black charged particles 62 can cover and block all light emitted by the photoluminescent layer 4 when the black state is displayed, avoid light leakage, effectively improve the display effect of the black state display, and then effectively improve the display brightness of the electronic paper display device 100.

[0057] See also Figures 1 to 5 In some embodiments of the present invention, the microcapsule 61 is a rectangular parallelepiped structure. In the extension direction of the first array substrate 10, the size of the microcapsule 61 is 0.7-0.8 times the size of the corresponding pixel unit (for example, 0.7 times, 0.72 times, 0.75 times, 0.78 times, 0.8 times, and the interval between any two end points); the volume of the black charged particle 62 is 0.5-0.8 times the volume of the microcapsule 61 (for example, 0.5 times, 0.6 times, 0.7 times, 0.8 times, and the interval between any two end points). Such a design can realize the black and white state display of the pixel unit, and the display effect of the black state display is better. Optionally, the size of the microcapsule 61 is 3 / 4 of the size of the corresponding pixel unit, and the volume of the black charged particle 62 is 1 / 3 of the volume of the microcapsule 61.

[0058] See also Figures 2 to 4 In some embodiments of the present invention, the black charged particles 62 carry positive charges. Under the action of the positive electric field generated by the portions of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 move to be opposite to the first one-way light-transmitting portion 51, so that the display state of the corresponding pixel unit is white; under the action of the positive electric field generated by the portions of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, the black charged particles 62 move to be opposite to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black.

[0059] Specifically, the first one-way light-transmitting portion 51 is a light-incoming channel, and the second one-way light-transmitting portion 52 is a light-outgoing channel. Under the action of the positive electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 carry positive charges and have a repulsive effect with the positive electric field. Under the repulsive effect, the black charged particles 62 move to be opposite to the first one-way light-transmitting portion 51 (light-incoming channel). At this time, the black charged particles 62 do not affect the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a white state; under the action of the positive electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, the black charged particles 62 carry positive charges and have a repulsive effect with the positive electric field. Under the repulsive effect, the black charged particles 62 move to be opposite to the second one-way light-transmitting portion 52 (light-outgoing channel). At this time, the black charged particles 62 block the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a black state.

[0060] Optionally, when the pixel unit is in a black state, the black charged particles 62 completely cover the second one-way light-transmitting portion 52 , which can completely shield and block the corresponding photoluminescent layer 4 from emitting light, and the black state display effect is better.

[0061] It should be noted that the size of the microcapsule 61 needs to be reasonably designed to achieve the black and white display effect of the above pixel unit.

[0062] Of course, in some other embodiments, the black charged particles 62 carry negative charges, and the electric field generated by the corresponding array substrate is a negative electric field. The black and white state display of the pixel unit can also be achieved based on the repulsive effect between the negative charges and the negative electric field.

[0063] See also Figure 3 In some embodiments of the present invention, under the positive electric field effect of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51 and the positive electric field effect of the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 move to the second one-way light-transmitting portion 52 opposite to and close to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Such a design can achieve that when the pixel unit is displayed in the black state, the black charged particles 62 completely cover and block the corresponding photoluminescent layer 4 from emitting light, so as to ensure a good black state display effect, and at the same time, there is no need to limit the size of the microcapsule 61, which facilitates the production of the microcapsule 61.

[0064] Of course, in some other embodiments, the black charged particles 62 may be positively charged, and under the action of the positive electric field generated by the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, and the negative electric field generated by the first array substrate 10 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 may also move to the second one-way light-transmitting portion 52 opposite to and close to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Alternatively, the black charged particles 62 may be negatively charged, and under the action of the negative electric field generated by the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, and the negative electric field generated by the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 may also move to the second one-way light-transmitting portion 52 opposite to and close to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Alternatively, the black charged particles 62 carry negative charges, and under the action of the negative electric field generated by the parts of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, and the positive electric field generated by the part of the first array substrate 10 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 can also move to the second one-way light-transmitting portion 52 opposite to and close to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black.

[0065] See also Figure 4 In one embodiment of the present invention, the black charged particles 62 carry positive charges. Under the positive electric field generated by the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, and the positive electric field generated by the first array substrate 10 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 move to the second one-way light-transmitting portion 52 and away from the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Such a design can achieve that the black charged particles 62 completely cover and block the corresponding photoluminescent layer 4 from emitting light when the pixel unit is displayed in the black state, so as to ensure a good black state display effect. At the same time, there is no need to limit the size of the microcapsule 61, which facilitates the production of the microcapsule 61.

[0066] Of course, in some other embodiments, the black charged particles 62 may be positively charged, and under the action of the positive electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, and the negative electric field generated by the portion of the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 may also move to the portion opposite to and away from the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Alternatively, the black charged particles 62 may be negatively charged, and under the action of the negative electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, and the negative electric field generated by the portion of the first array substrate 10 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 may also move to the portion opposite to and away from the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black. Alternatively, the black charged particles 62 carry negative charges, and under the action of the negative electric field generated by the parts of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light-transmitting portion 52 and the positive electric field generated by the part of the second array substrate 20 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 can also move to the second one-way light-transmitting portion 52 opposite to and away from the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is black.

[0067] See also Figure 5 In some embodiments of the present invention, the black charged particles 62 carry positive charges. Under the action of the positive electric field generated by the portions of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light-transmitting portion 52 and the negative electric field generated by the portions of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, the black charged particles 62 move to be opposite to the first one-way light-transmitting portion 51, so that the display state of the corresponding pixel unit is a white state; under the action of the positive electric field generated by the portions of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light-transmitting portion 51, the positive electric field generated by the portion of the second array substrate 20 corresponding to the second one-way light-transmitting portion 52 and the negative electric field generated by the portion of the first array substrate 10 corresponding to the second one-way light-transmitting portion 52, the black charged particles 62 move to be opposite to and close to the second one-way light-transmitting portion 52, so that the display state of the corresponding pixel unit is a black state.

[0068] This embodiment uses the synergistic effect of the positive and negative electric fields of the first array substrate 10 and the second array substrate 20. Under the combined effect of the repulsive effect of the positive electric field on the positive charges and the attractive effect of the negative electric field on the positive charges, the movement of the black charged particles 62 is more sensitive and faster, that is, the response speed of the black and white display screen of the pixel unit is faster. Compared with using one electric field, the synergistic effect of two electric fields can increase the response speed of the black and white screen by 0.5-1 times.

[0069] Of course, in some other embodiments, the black charged particles 62 may also carry negative charges, and under the action of the negative electric field generated by the parts of the first array substrate 10 and the second array substrate 20 corresponding to the second one-way light transparent portion 52 and the positive electric field generated by the parts of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light transparent portion 51, the black charged particles 62 can also move to be opposite to the first one-way light transparent portion 51, so that the display state of the corresponding pixel unit is white; under the action of the negative electric field of the parts of the first array substrate 10 and the second array substrate 20 corresponding to the first one-way light transparent portion 51, the negative electric field generated by the part of the second array substrate 20 corresponding to the second one-way light transparent portion 52, and the positive electric field generated by the part of the first array substrate 10 corresponding to the second one-way light transparent portion 52, the black charged particles 62 can also move to be opposite to and close to the second one-way light transparent portion 52, so that the display state of the corresponding pixel unit is black.

[0070] Of course, in some other embodiments, when the display state of the pixel unit is black, the synergistic effect of the positive and negative electric fields can be used to move the charged black particles to a position opposite to and away from the second one-way light-transmitting portion 52. The specific electric field design can be determined based on the electrical properties of the black charged particles 62.

[0071] See also Figure 6 In one embodiment of the present invention, the microcapsule 61 includes a first microcapsule portion 611 and a second microcapsule portion 612 which are vertically connected, the first microcapsule portion 611 extends in a direction parallel to the surface of the first array substrate 10, and the second microcapsule portion 612 extends in a direction perpendicular to the surface of the first array substrate 10 and toward the one-way light-transmitting layer 5; the first microcapsule portion 611 covers the entire second one-way light-transmitting portion 52, and the second microcapsule portion 612 covers part of the first one-way light-transmitting portion 51; the size of the first microcapsule portion 611 in a direction parallel to the surface of the first array substrate 10 is not less than the size of the second microcapsule portion 612 in a direction perpendicular to the surface of the first array substrate 10, and the volume of the black charged particles 62 is the same as the volume of the second microcapsule portion 612.

[0072] Specifically, the shape of the microcapsule 61 is a right-angle structure, including a first microcapsule part 611 and a second microcapsule part 612 connected vertically, the first microcapsule part 611 is parallel to the board surface of the first array substrate 10, and in the extension direction of the board surface of the first array substrate 10, the first microcapsule part 611 is equal to the size of the second one-way light-transmitting part 52, so that the first microcapsule part 611 can completely cover the second one-way light-transmitting part 52, and the length dimension of the first microcapsule part 611 along the direction parallel to the board surface of the first array substrate 10 is not less than the dimension of the second microcapsule part 612 along the direction perpendicular to the board surface of the first array substrate 10, and the volume of the black charged particles 62 is equal to the second microcapsule part 61. 2 has the same volume. With such a design, when the black charged particles 62 carry positive charges, under the action of the positive electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the first microcapsule portion 611, the black charged particles 62 move into the second microcapsule portion 612. At this time, the black charged particles 62 do not affect the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a white state; under the action of the positive electric field generated by the portion of the first array substrate 10 and the second array substrate 20 corresponding to the second microcapsule portion 612, the black charged particles 62 move into the first microcapsule portion 611. At this time, the black charged particles 62 shield and block the light emission of the photoluminescent layer 4, and the corresponding pixel unit is displayed in a black state. Of course, when the black charged particles 62 carry negative charges, changing the positive electric field to a negative electric field can also realize the display of the black and white states of the pixel unit.

[0073] Optionally, the size of the first microcapsule portion 611 is equal to the size of the second microcapsule portion 612, and the volume of the black charged particles 62 is the same as the volume of the second microcapsule portion 612, so that when the pixel unit is displayed in a black state, the black charged particles 62 can fill the entire first microcapsule portion 611, so that the black state display effect is better.

[0074] In an optional embodiment of the present invention, the material of the photoluminescent layer 4 is a long afterglow luminescent material, which has the ability to absorb and store external light sources and stimulate the release of light. In this way, it is not completely dependent on external ambient light and can be displayed in the dark. That is, the electronic paper display device 100 provided by the present invention can be used in the dark.

[0075] Optionally, the thickness of the photoluminescent layer 4 is 1-2 μm (such as 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm and any interval between the two end points). The photoluminescent layer 4 selected in the above thickness range has good performance of absorbing and storing external light sources and stimulating the release of light, while reducing the overall thickness of the electronic paper display device 100 to a certain extent.

[0076] Please refer again Figures 1 to 6In some embodiments of the present invention, the first array substrate 10 and the second array substrate 20 both include a base substrate 1 and a thin film transistor circuit layer 2, the base substrate 1 is provided with a plurality of pixel units, and the thin film transistor circuit layer 2 is arranged on the base substrate 1 to generate a positive electric field or a negative electric field.

[0077] Specifically, the base substrate 1 can be selected as a glass substrate or a polyvinyl chloride (PVC) substrate, the thin film transistor circuit layer 2 has a TFT metal line, which is electrically connected to the driver IC and is controlled by the driver IC to form an electric field. The specific structure and production of the base substrate 1 and the thin film transistor circuit layer 2 can refer to the existing technology and will not be described in detail here.

[0078] Please refer again Figures 1 to 6 In some embodiments of the present invention, the electronic paper display device 100 further includes two insulating protective layers 3, which are respectively arranged on the surface of the first array substrate 10 facing the photoluminescent layer 4 and the surface of the second array substrate 20 facing the microcapsule structure layer 6. The insulating protective layer 3 plays the role of insulating, flattening and protecting the metal lines in the first array substrate 10 and the second array substrate 20 to prevent the metal from being exposed and corroded. Optionally, the material of the insulating protective layer 3 can be selected from siloxane or fusible polytetrafluoroethylene; the thickness of the insulating protective layer 3 is 2-3μm (such as 2μm, 2.2μm, 2.5μm, 2.8μm, 3μm and the interval between any two end points).

[0079] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic paper display device, characterized in that: include: A first array substrate and a second array substrate are arranged opposite to each other, wherein the first array substrate is provided with a plurality of pixel units arranged in an array; A photoluminescent layer is provided on a surface of the first array substrate facing the second array substrate; a one-way light-transmitting layer, arranged on a surface of the photoluminescent layer facing away from the first array substrate, the one-way light-transmitting layer comprising a plurality of first one-way light-transmitting portions and second one-way light-transmitting portions which are alternately arranged and have opposite light-transmitting directions, wherein two adjacent first one-way light-transmitting portions and the second one-way light-transmitting portions are arranged corresponding to one pixel unit; a microcapsule structure layer, disposed between the one-way light-transmitting layer and the second array substrate, the microcapsule structure layer comprising a plurality of microcapsules, one microcapsule being disposed corresponding to one pixel unit and covering at least a portion of a surface corresponding to the first one-way light-transmitting portion and at least a portion of a surface corresponding to the second one-way light-transmitting portion; The microcapsule includes a plurality of black charged particles, and the black charged particles can move under the action of the electric field of the first array substrate and the second array substrate to control the display brightness of the corresponding pixel unit.

2. The electronic paper display device according to claim 1, characterized in that: The light transmission direction of the first one-way light-transmitting portion is from the one-way light-transmitting layer to the photoluminescent layer, and the light transmission direction of the second one-way light-transmitting portion is from the photoluminescent layer to the one-way light-transmitting layer; When the black charged particles move to be opposite to the first one-way light-transmitting portion under the action of the electric field of the first array substrate and the second array substrate, the display state of the corresponding pixel unit is a white state; When the black charged particles move to be opposite to the second one-way light-transmitting portion under the action of the electric field of the first array substrate and the second array substrate, the display state of the corresponding pixel unit is a black state.

3. The electronic paper display device according to claim 2, characterized in that: The microcapsules cover the entire second one-way light-transmitting portion and at least a portion of the first one-way light-transmitting portion; When the display state of the pixel unit is a black state, the black charged particles cover the entire second one-way light-transmitting portion.

4. The electronic paper display device according to claim 3, characterized in that: The microcapsule is a rectangular parallelepiped structure, and in the extension direction of the first array substrate, the size of the microcapsule is 0.7-0.8 times the size of the corresponding pixel unit; The volume of the black charged particles is 0.5-0.8 times the volume of the microcapsule.

5. The electronic paper display device according to claim 4, characterized in that: The black charged particles have positive charges, and under the action of the positive electric field generated by the first array substrate and the second array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to be opposite to the first one-way light-transmitting portion, so that the display state of the corresponding pixel unit is white; Under the action of the positive electric field generated by the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the black charged particles move to be opposite to the second one-way light-transmitting portion, so that the display state of the corresponding pixel unit is black.

6. The electronic paper display device according to claim 5, characterized in that: Under the action of the positive electric field generated by the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, and the positive electric field generated by the second array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to the second one-way light-transmitting portion opposite to and close to the second one-way light-transmitting portion, so that the display state of the corresponding pixel unit is black; or, Under the action of the positive electric field generated by the parts of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, and the positive electric field generated by the part of the first array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to the second one-way light-transmitting portion opposite to and away from the second one-way light-transmitting portion, so that the display state corresponding to the pixel unit is black.

7. The electronic paper display device according to claim 4, characterized in that: The black charged particles have positive charges, and under the action of the positive electric field generated by the portions of the first array substrate and the second array substrate corresponding to the second one-way light-transmitting portion and the negative electric field generated by the portions of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the black charged particles move to be opposite to the first one-way light-transmitting portion, so that the display state of the corresponding pixel unit is a white state; Under the action of the positive electric field generated by the parts of the first array substrate and the second array substrate corresponding to the first one-way light-transmitting portion, the positive electric field generated by the part of the second array substrate corresponding to the second one-way light-transmitting portion, and the negative electric field generated by the part of the first array substrate corresponding to the second one-way light-transmitting portion, the black charged particles move to a position opposite to and close to the second one-way light-transmitting portion, so that the display state corresponding to the pixel unit is black.

8. The electronic paper display device according to claim 3, characterized in that: The microcapsule comprises a first microcapsule portion and a second microcapsule portion which are vertically connected, the first microcapsule portion extending in a direction parallel to the surface of the first array substrate, and the second microcapsule portion extending in a direction perpendicular to the surface of the first array substrate and toward the one-way light-transmitting layer; The first microcapsule portion covers the entire second one-way light-transmitting portion, and the second microcapsule portion covers a portion of the first one-way light-transmitting portion; The size of the first microcapsule portion in a direction parallel to the first array substrate surface is not smaller than the size of the second microcapsule portion in a direction perpendicular to the first array substrate surface, and the volume of the black charged particles is the same as that of the second microcapsule portion.

9. The electronic paper display device according to claim 1, wherein: In the extension direction of the first array substrate, the size of the first one-way light-transmitting portion is the same as the size of the second one-way light-transmitting portion, and the size of the first one-way light-transmitting portion accounts for 1 / 2 of the size of the corresponding pixel unit; and / or, The one-way light-transmitting layer is a polyester film or a polycarbonate film, and the thickness of the one-way light-transmitting layer is 1-2 μm; and / or, The material of the photoluminescent layer is a long afterglow luminescent material, and the thickness of the photoluminescent layer is 1-2 μm.

10. The electronic paper display device according to any one of claims 1 to 9, characterized in that: The first array substrate and the second array substrate both include a base substrate and a thin film transistor circuit layer, the base substrate is provided with a plurality of the pixel units, and the thin film transistor circuit layer is arranged on the base substrate to generate a positive electric field or a negative electric field; and / or, The electronic paper display device further comprises two insulating protective layers, which are respectively arranged on a surface of the first array substrate facing the photoluminescent layer and a surface of the second array substrate facing the microcapsule structure layer.

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