TW201423248A - Electronic paper module and display device using the same - Google Patents

Abstract

An electronic paper display device is provided. The electronic paper display device includes a housing, a screen module accommodated in the housing, a power source and a driving circuit board. The screen module includes a lower substrate, a upper substrate, a electrophoretic medium layer and a output circuit board. A pixel electrode layer is arranged on the lower substrate, a common electrode layer is placed on the upper substrate, and the electrophoretic medium layer is arranged between the pixel electrode layer and the common electrode layer. The common electrode layer includes a first protrusion extending from the edge of the common electrode layer, the pixel electrode layer includes a second protrusion extending from the edge thereof. The first protrusion and the second protrusion electrically connect to the output circuit board respectively. The output circuit board is configured to electrically connect the screen module and the driving board.

Description

Electronic paper display device and electronic paper display screen module thereof

The invention relates to a display device, in particular to a bistable electronic paper display device and an electronic paper display screen module thereof.

Due to its low power consumption, flexibility, and thin thickness, electronic paper displays are widely used as display screens in electronic products such as mobile phones, e-books, computers, and personal digital assistants. The structure of the electronic paper display generally includes an upper substrate, a lower substrate, and an electrophoretic display medium layer. The lower surface of the upper substrate is provided with a common indium tin oxide (ITO) electrode, and the upper surface of the lower substrate is provided with a plurality of thin film transistors (Thin Film Transistor (TFT) element electrode, electrophoretic display medium layer is closely attached between the common ITO electrode and the TFT element electrode. The common ITO electrode and the TFT primitive electrode are connected to a voltage source through a circuit layer, and a potential difference is formed between the common ITO electrode and the TFT element electrode by driving the voltage source, thereby controlling the electrophoretic display medium layer to perform display.

There are two main ways of connecting the common ITO electrode and the TFT element electrode to the circuit layer: one is to provide a plurality of through holes on the electrophoretic display medium layer, and the through holes are filled with conductive silver glue, thereby electrically oxidizing the common ITO electrodes. Connected to one of the TFT pixel electrodes, the plurality of TFT pixel electrodes are further connected to the circuit layer to electrically connect the common ITO electrode and the TFT primitive electrode to the voltage source; and the other is to display the medium layer in the electrophoretic display layer. Conductive silver glue is disposed on the side to electrically connect the common ITO electrode to a TFT element electrode, and the plurality of TFT element electrodes are electrically connected to the circuit layer, thereby discharging the common ITO electrode and the TFT element electrode to an external voltage source. connection. In the above two methods, the common ITO electrode is first electrically connected to the TFT element electrode by using a conductive silver paste, and the common ITO electrode is indirectly connected to the circuit layer through the TFT element electrode. The indirect connection method is not stable enough, and the electrical connection method using the conductive silver glue contacts is prone to contact failure when encountering thermal shock.

In view of this, it is necessary to provide an electronic paper device which is simple in manufacturing process and thin and light.

An electronic paper display device includes a casing and an electronic paper display screen module, a power module and a driving circuit board housed in the casing, the electronic paper display screen module comprising a lower substrate, an electrophoretic display medium layer and an upper a substrate, the electrophoretic display medium layer is disposed between the upper substrate and the lower substrate, the electronic paper display screen module further includes a lead-out circuit board, and the electrode layer provided on the surface of the lower substrate adjacent to the electrophoretic display medium layer is disposed a common electrode layer is disposed on the surface of the upper substrate adjacent to the electrophoretic display medium layer, and the common electrode layer extends a first protrusion relative to a periphery of the electrophoretic display medium layer, wherein the element electrode layer is opposite to the electrophoretic display medium layer Extending a second protruding portion, the first protruding portion and the second protruding portion are electrically connected to the lead-out circuit board, respectively, the lead-out circuit board is configured to electrically charge the electronic paper display screen module and the driving circuit board connection.

An electronic paper display screen module comprising a lower substrate, an electrophoretic display medium layer and an upper substrate, wherein the electrophoretic display medium layer is disposed between the upper substrate and the lower substrate, the electronic paper display screen module further comprising an export circuit board, the lower a pixel electrode layer is disposed on the surface of the substrate adjacent to the electrophoretic display medium layer, and a common electrode layer is disposed on the surface of the upper substrate adjacent to the electrophoretic display medium layer, and the common electrode layer extends from the periphery of the electrophoretic display medium layer a first protruding portion, the primitive electrode layer extends a second protruding portion with respect to a periphery of the electrophoretic display medium layer, and the first protruding portion and the second protruding portion are electrically connected to the lead-out circuit board, respectively. The circuit board is used to electrically connect the electronic paper display screen module to the driving circuit board.

The common electrode layer of the electronic paper display device and the electronic paper display screen module provided by the present invention is directly electrically connected to the lead-out circuit board through the first protruding portion, and the element electrode layer is directly electrically connected to the derived circuit board through the second protruding portion. Upper, the connection structure is stable. And the output circuit board is located outside the electronic paper display screen module, and can be electrically connected to the driving circuit board conveniently.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 , the electronic paper display device 100 is a reflective electrophoretic display device, and includes a housing 101 , an electronic paper display screen module 10 housed in the housing 101 , a power module (not shown), and A drive circuit board (not shown) that drives electronic paper for display, and the like.

Referring to FIG. 2 and FIG. 3 together, the electronic paper display screen module 10 includes a lower substrate 20, an electrophoretic display medium layer 30, and an upper substrate 40. The electrophoretic display medium layer 30 is placed between the lower substrate 20 and the upper substrate 40. The upper substrate 40 is located on one side of the viewing surface of the user.

A common electrode layer 42 is provided on the surface of the upper substrate 40 close to the electrophoretic display medium layer 30. In the present embodiment, the common electrode layer 42 is a full-surface ITO electrode. The material of the common electrode layer 42 may be indium tin oxide, aluminum zinc oxide or cadmium tin oxide. The upper substrate 40 may be a glass substrate or a transparent plastic substrate having a high light transmittance. The upper substrate 40 selected in the present embodiment is made of polymethyl methacrylate (PMMA) material. A protective layer (shown) is further disposed on the surface of the upper substrate 40 away from the electrophoretic display medium layer 30, and the protective layer is a transparent film with high transmittance.

A primitive electrode layer 22 is disposed on the surface of the lower substrate 20 adjacent to the electrophoretic display medium layer 30. The primitive electrode layer 22 includes a plurality of primitive electrodes 201, an electrode circuit layer 202, and a photo electrode layer 201 and an electrode circuit layer 202. The insulating layer 203 is between. The element electrode layer 22 may be a Thin Film Transistor (TFT) element electrode layer, and the electrode circuit layer 202, the insulating layer 203, and the plurality of element electrodes are sequentially printed on the substrate by a method of printing etching. 201, the pixel electrode 201 is electrically connected to the electrode circuit layer 202 through the conductive channel 204 etched on the insulating layer 203, and the conductive channel 204 can be filled with an anisotropic conductive adhesive, a conductive medium such as a conductive silver paste, thereby The element electrode 201 is electrically connected to the electrode circuit layer 202. The lower substrate 20 may be a glass substrate, a plastic substrate, a circuit board, or a flexible circuit board.

The electrophoretic display medium layer 30 is bonded between the common electrode layer 42 and the primitive electrode layer 22 by an adhesive. The electrophoretic display medium layer 30 is a bistable electrophoretic display medium, and in the present embodiment, a microcapsule type electrophoretic display medium is used. The electrophoretic display medium layer 30 includes a plurality of microcapsules 302, which may be in the form of spheres, spheroids, tubes or elliptical shapes, and the like.

It is an internal structure diagram of the microcapsule 302. The microcapsules 302 are housed with a dielectric solution, and first electrophoretic particles and second electrophoretic particles having different electrical and optical properties encapsulated within the microcapsules 302. In the present embodiment, the first electrophoretic particles are white positively charged particles, and the second electrophoretic particles are black negatively charged particles. The first electrophoretic particles and the second electrophoretic particles move in the microcapsules 302 according to a voltage difference applied between the common electrode layer 42 and the primitive electrode layer 22, and are applied to the common electrode layer 42 and the primitive electrode layer 22 by the pair. The positive and negative voltages and the magnitude of the voltage difference between the first electrophoretic particles and the second electrophoretic particles can be controlled to control the content displayed by the electronic paper display device 100.

The common electrode layer 42 extends toward the periphery of the electrophoretic display medium layer 30, and at least one first protruding portion 421 protrudes outwardly. The primitive electrode layer 22 protrudes from the periphery of the electrophoretic display medium layer 30 by at least one second protrusion. In the embodiment, the electrode circuit layer 202 of the primitive electrode layer 22 protrudes from the periphery of the electrophoretic display medium layer 30 by a second protrusion 221, and the first protrusion 421 and the second protrusion 221 respectively Electrically connected to a lead-out circuit board 50 for electrically connecting to a drive circuit board housed in the housing 101, the drive circuit board controlling application to the common electrode layer 42 and the picture element electrode The voltage between layers 22. In the present embodiment, the lead-out circuit board 50 includes a first lead-out electrode 51 and a second lead-out electrode 52 respectively disposed on opposite sides of the lead-out board 50, and the first protrusions 421 of the common electrode layer 42 are electrically connected. The second protruding portion 221 of the primitive electrode layer 22 is electrically connected to the second lead-out electrode 52 at the first lead-out electrode 51. The first protruding portion 421 and the first lead-out electrode 51 and between the second protruding portion 221 and the second lead-out electrode 52 may be electrically connected by a conductive medium 53 such as an anisotropic conductive paste or a conductive silver paste.

In the present embodiment, the size of the upper substrate 40 and the lower substrate 20 is larger than the size of the electrophoretic display medium layer 30, and the sealant 60 is filled in the peripheral space of the electrophoretic display medium layer 30 between the upper substrate 40 and the lower substrate 20. The lead-out circuit board 50 is disposed outside the electronic paper display screen module 10 so as to be electrically connected to the driving circuit board. The sealant 60 may be an epoxy resin, a enamel resin, an acrylic resin or the like, or a photocurable type, a thermosetting type or a two-liquid type hardening type resin.

The common electrode layer 42 is directly electrically connected to the lead-out circuit board 50 through the first protruding portion 421, and the pixel electrode layer 22 is directly electrically connected to the lead-out circuit board 50 through the second protruding portion 221, and the connection structure is stabilized. And the lead-out circuit board 50 is located outside the electronic paper display screen module 10, and can be electrically connected to the driving circuit board conveniently.

Those skilled in the art will recognize that the above-described embodiments are merely illustrative of the invention and are not to be construed as limiting the scope of the invention. Neither is it within the scope of the patent protection of the present invention.

100. . . Electronic paper display device

101. . . case

10. . . Electronic paper display screen module

20. . . Lower substrate

twenty two. . . Element electrode layer

201. . . Element electrode

202. . . Electrode circuit layer

203. . . Insulation

204. . . Conduction channel

221. . . Second protrusion

30. . . Electrophoretic display medium layer

302. . . Microcapsules

40. . . Upper substrate

42. . . Common electrode layer

421. . . First protrusion

50. . . Export board

51. . . First derived electrode

52. . . Second derived electrode

53. . . Conductive medium

60. . . Sealants

1 is a schematic view showing the structure of an electronic paper device of the present invention.

2 is a schematic structural view of an electronic paper display screen module of the electronic paper device of FIG. 1.

3 is a schematic cross-sectional structural view of the electronic paper display screen module of FIG. 2.

20. . . Lower substrate

twenty two. . . Element electrode layer

201. . . Element electrode

202. . . Electrode circuit layer

203. . . Insulation

204. . . Conduction channel

221. . . Second protrusion

302. . . Microcapsules

40. . . Upper substrate

42. . . Common electrode layer

421. . . First protrusion

50. . . Export board

51. . . First derived electrode

52. . . Second derived electrode

53. . . Conductive medium

60. . . Sealants

Claims (13)

An electronic paper display device comprising a casing, an electronic paper display screen module housed in the casing, a power module and a driving circuit board, the electronic paper display screen module comprising a lower substrate, an electrophoretic display medium layer and an upper The substrate, the electrophoretic display medium layer is disposed between the upper substrate and the lower substrate, wherein the electronic paper display screen module further comprises a lead-out circuit board disposed on a surface of the lower substrate adjacent to the electrophoretic display medium layer a photo electrode layer having a common electrode layer on a surface of the upper substrate adjacent to the electrophoretic display medium layer, wherein the common electrode layer extends a first protrusion relative to a periphery of the electrophoretic display medium layer, and the element electrode layer Extending a second protrusion relative to a periphery of the electrophoretic display medium layer, the first protrusion and the second protrusion are respectively electrically connected to the lead-out circuit board, and the lead-out circuit board is used for displaying the electronic paper display screen The group is electrically connected to the drive board. The electronic paper display device according to claim 1, wherein the lead-out circuit board includes a first lead-out electrode and a second lead-out electrode respectively disposed on opposite sides of the lead-out circuit board, and a common electrode layer A protrusion is electrically connected to the first lead-out electrode, and a second protrusion of the element electrode layer is electrically connected to the second lead-out electrode. The electronic paper display device according to claim 1, wherein the first protruding portion and the first lead-out electrode and the second protruding portion and the second lead-out electrode are electrically connected by a conductive medium. The electronic paper display device according to claim 1, wherein the conductive medium is an anisotropic conductive paste or a conductive silver paste. The electronic paper display device according to claim 1, wherein the upper substrate is a glass substrate or a transparent plastic substrate. The electronic paper display device according to claim 1, wherein the electrophoretic display medium layer is a microcapsule electrophoretic display medium. The electronic paper display device of claim 4, wherein the primitive electrode layer comprises a plurality of primitive electrodes, an electrode circuit layer, and an insulating layer disposed between the primitive electrode and the electrode circuit layer, the insulation A conductive channel is disposed on the layer, and the conductive medium filled in the conductive channel of the primitive electrode is electrically connected to the electrode circuit layer. The electronic paper display device according to claim 1, wherein an electrophoretic display medium layer between the upper substrate and the lower substrate is filled with a sealant, and the lead circuit board passes through the sealant at the electron The outside of the paper display screen module. An electronic paper display screen module comprising a lower substrate, an electrophoretic display medium layer and an upper substrate, wherein the electrophoretic display medium layer is disposed between the upper substrate and the lower substrate, wherein the electronic paper display device further comprises an export a circuit board having a picture electrode layer disposed on a surface of the lower substrate adjacent to the electrophoretic display medium layer, wherein a common electrode layer is disposed on the surface of the upper substrate adjacent to the electrophoretic display medium layer, and the common electrode layer is opposite to the electrophoretic display medium layer Extending a first protrusion, the element electrode layer extends a second protrusion relative to a periphery of the electrophoretic display medium layer, and the first protrusion and the second protrusion are electrically connected to the derivation circuit respectively board. The electronic paper display screen module of claim 9, wherein the lead-out circuit board comprises a first lead-out electrode and a second lead-out electrode respectively disposed on opposite sides of the lead-out circuit board, and the common electrode layer The first protruding portion is electrically connected to the first lead-out electrode, and the second protruding portion of the primitive electrode layer is electrically connected to the second lead-out electrode. The electronic paper display screen module of claim 10, wherein the first protrusion and the first lead-out electrode and the second protrusion and the second lead-out electrode are electrically connected by a conductive medium. . The electronic paper display screen module according to claim 11, wherein the conductive medium is an anisotropic conductive paste or a conductive silver paste. The electronic paper display screen module according to claim 9, wherein the peripheral space between the upper substrate and the lower substrate is filled with a sealant, and the lead circuit board passes through the sealant. Located on the outside of the electronic paper display module.