Passive hybrid type display device and driving method thereof

Abstract

A passive hybrid type display device includes a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a driving control chip and an interface part connected to the driving control chip, wherein the driving backplane of the passive electrophoretic electronic paper display area and the upper substrate or lower substrate of the passive liquid crystal display area share the same substrate, and the passive liquid crystal display area and the passive electrophoretic electronic paper display area do not overlap, and the driving control chip and the interface part are both arranged on the substrate or connected to the substrate through a COF packaging method. Such a product has a simple structure, low cost, can achieve display diversification, and expand the product application range. The present invention also provides a driving method for a passive hybrid type display device.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic paper, and in particular to a passive hybrid display device and a driving method thereof. Background Art

[0002] As the Internet enters the era of the Internet of Things, where everything is connected, electronic paper has become an important display medium for information exchange and communication. Electronic paper has paper-like image storage and display characteristics due to its passive luminescence, and it can replace a single image with ultra-low power consumption, so it is widely used in paper-like display fields such as e-books and electronic shelf labels. In the electronic paper market, electrophoretic electronic paper occupies a dominant position. The principle of electrophoretic electronic paper is that under the action of an electric field, the electrophoretic particles move in a directional manner in the electrophoretic liquid. The electric fields in different directions acting on the electrophoretic particles can make them present different colors. The various particles can display images and texts according to the desired arrangement.

[0003] The passive liquid crystal display represented by TN / STN and cholesteric liquid crystal electronic paper screens and passive electrophoretic electronic paper display screens have the following main advantages and disadvantages: the traditional TN / STN liquid crystal screen has a wide operating temperature range, which can reach -45℃~70℃, and the display content disappears when the power is off; the cholesteric liquid crystal electronic paper screen has a wider operating temperature range, which is about -20℃~60℃, and the display content does not disappear when the power is off. The response time of both is about 50~100ms, and the cholesteric liquid crystal electronic paper screen can achieve the purpose of full-color display through existing technology; the passive electrophoretic electronic paper display screen has a slower response speed than the passive liquid crystal display screen, and the minimum response time (black and white switching) is more than 200ms. Here it mainly refers to segmented electronic paper. If it is multi-color paper, the response time is longer, and it can only adapt to the display of static content such as text and pictures. The operating temperature range is narrow, the display content does not disappear when the power is off, and the display color is single. At present, only simple multi-color display such as black / white or black / white / red or black / white / yellow can be realized.

[0004] Although passive liquid crystal display and passive electrophoretic electronic paper display have their own advantages in display, the disadvantage is that no matter which display is used alone, its application scope will be greatly restricted due to its own defects. Summary of the invention

[0005] In view of this, the present invention provides a passive hybrid type display device and a driving method thereof which have a simple structure, low cost, can realize display diversification, and expand the application range of products, so as to solve the above problems.

[0006] A passive hybrid type display device comprises a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a driving control chip and an interface part connected to the driving control chip, wherein the driving backplane of the passive electrophoretic electronic paper display area and the upper substrate or the lower substrate of the passive liquid crystal display area share the same substrate, and the passive liquid crystal display area and the passive electrophoretic electronic paper display area do not overlap, the driving control chip and the interface part are both arranged on the substrate or connected to the substrate through a COF packaging method, the passive liquid crystal display area has a liquid crystal box and a liquid crystal layer filled in the liquid crystal box, the passive electrophoretic electronic paper display area comprises a protective film, an OCA glue layer connected to the protective film, a transparent substrate connected to the protective film through the OCA glue layer and having a common electrode, an electrophoretic layer located between the substrate and the transparent substrate, and a sealing member connected to the edge of the protective film and the substrate and forming a sealed space with the protective film and the substrate.

[0007] Furthermore, the liquid crystal box of the passive liquid crystal display area includes an upper substrate, a lower substrate, an upper orientation film covering the side of the upper substrate facing the lower substrate, a lower orientation film attached to the side of the lower substrate facing the upper substrate, and a sealing portion located between the upper orientation film and the lower orientation film and forming a sealed space with the upper substrate and the lower substrate.

[0008] Furthermore, the substrate is a glass substrate or a flexible substrate, and a part of the substrate serves as an upper substrate or a lower substrate.

[0009] Furthermore, the upper substrate or the lower substrate of the passive liquid crystal display area is made of borosilicate glass, with a thickness less than or equal to 0.55 mm.

[0010] Furthermore, the driving backplane of the passive electrophoretic electronic paper display area and the driving backplane of the passive liquid crystal display area share the same substrate, and the substrate is a PCB substrate, a glass substrate or a flexible substrate.

[0011] Furthermore, the passive liquid crystal display area also includes a connector connecting the liquid crystal box and the substrate, and the connector is a flexible circuit board, a conductive rubber strip or a metal connector.

[0012] Furthermore, the upper substrate and the lower substrate of the passive liquid crystal display area may be borosilicate glass or a flexible substrate, with a thickness less than or equal to 0.2 mm.

[0013] Furthermore, the liquid crystal layer is TN / STN liquid crystal or CHLCD liquid crystal. When the liquid crystal layer adopts TN / STN liquid crystal, an upper polarizer is arranged on the outer side of the upper substrate, and a lower polarizer is arranged on the outer side of the lower substrate.

[0014] Furthermore, the number of the passive liquid crystal display area and the passive electrophoretic electronic paper display area can be multiple, and the distribution of the multiple passive liquid crystal display areas and the passive electrophoretic electronic paper display areas can be arbitrarily combined according to user needs.

[0015] A method for driving a passive hybrid type display device comprises the following steps:

[0016] Step S1: providing a passive hybrid type display device, wherein the passive hybrid type display device comprises a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a drive control chip, and an interface part connected to the drive control chip;

[0017] Step S2: the driving control chip is connected to the passive liquid crystal display area and the passive electrophoretic electronic paper display area through a plurality of driving signal multiplexing units;

[0018] Step S3: the output end of the drive control chip outputs a control signal to a plurality of drive signal multiplexing units;

[0019] Step S4: the signal loading end of the drive control chip further outputs an AC waveform signal or a DC waveform signal to a plurality of drive signal multiplexing units;

[0020] Step S5: the plurality of drive signal multiplexing units select to output an AC drive signal or a DC drive signal under the action of the control signal;

[0021] Step S6: the plurality of driving signal multiplexing units send the AC driving signal to the passive liquid crystal display area, and send the DC driving signal to the passive electrophoretic electronic paper display area.

[0022] Compared with the prior art, the passive hybrid type display device of the present invention includes a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a driving control chip and an interface part connected to the driving control chip, the driving backplane of the passive electrophoretic electronic paper display area and the upper substrate or lower substrate of the passive liquid crystal display area share the same substrate, and the passive liquid crystal display area and the passive electrophoretic electronic paper display area do not overlap, the driving control chip and the interface part are both arranged on the substrate or connected to the substrate through a COF packaging method, the passive liquid crystal display area has a liquid crystal box and a liquid crystal layer filled in the liquid crystal box, the passive electrophoretic electronic paper display area includes a protective film, an OCA glue layer connected to the protective film, a transparent substrate connected to the protective film through the OCA glue layer and having a common electrode, an electrophoretic layer located between the substrate and the transparent substrate, and a seal connected to the edge of the protective film and the substrate and forming a sealed space with the protective film and the substrate. In this way, the product structure is simple, the cost is low, the display diversification can be achieved, and the application range of the product is expanded. The present invention also provides a driving method for a passive hybrid type display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein:

[0024] Figure 1A side cross-sectional view of a first embodiment of a passive hybrid display device provided by the present invention.

[0025] Figure 2 A side cross-sectional view of a second embodiment of a passive hybrid display device provided by the present invention.

[0026] Figure 3 A driving schematic diagram of a passive hybrid display device provided by the present invention. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are further described in detail below based on the accompanying drawings. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the protection scope of the present invention.

[0028] Please refer to Figure 1 , which is a first embodiment of a passive hybrid type display device provided by the present invention, including a passive liquid crystal display area 100, a passive electrophoretic electronic paper display area 200, a driving control chip 20 and an interface part 30 connected to the driving control chip 20.

[0029] The driving backplane of the passive electrophoretic electronic paper display area 200 and the upper substrate or lower substrate of the passive liquid crystal display area 100 share the same substrate 10, but the display areas do not overlap. The driving control chip 20 and the interface part 30 are connected to the substrate 10 or connected to the substrate 10 through a COF (Chip On Film) packaging method, and apply different driving signals to different types of display areas.

[0030] In this embodiment, the substrate 10 is a glass substrate.

[0031] When the driving backplane of the passive electrophoretic electronic paper display area 200 and the lower substrate of the passive liquid crystal display area 100 share the same substrate 10, the passive liquid crystal display area 100, in addition to the substrate 10, also includes an upper substrate 120, an upper orientation film 130 covering the side of the upper substrate 120 facing the substrate 10, a lower orientation film 150 attached to the side of the substrate 10 facing the upper substrate 120, a sealing portion 140 located between the upper orientation film 130 and the lower orientation film 150 and forming a sealed space with the upper substrate 120 and the substrate 10, and a liquid crystal layer filled in the sealed space and containing a spacer material. Preferably, the liquid crystal layer is mainly TN / STN liquid crystal, and at this time, an upper polarizer needs to be added on the outer side of the upper substrate 120, and a lower polarizer needs to be added on the outer side of the substrate 10.

[0032] The substrate 10 and the upper substrate 120 are both made of borosilicate glass, with a thickness less than or equal to 0.55 mm, which is beneficial to increase the transmittance and reduce the total thickness of the passive hybrid type display device. The substrate 10, the upper substrate 120, the upper alignment film 130, the lower alignment film 150 and the sealing part 140 form a liquid crystal box, and the liquid crystal layer is filled in the liquid crystal box.

[0033] The liquid crystal cell is a CHLCD liquid crystal cell, or a TN / STN liquid crystal cell.

[0034] In other embodiments, when the driving backplane of the passive electrophoretic electronic paper display area 200 and the upper substrate of the passive liquid crystal display area 100 share the same substrate 10, the passive liquid crystal display area 100, in addition to the substrate 10, also includes a lower substrate, a lower orientation film covering the side of the lower substrate facing the substrate 10, an upper orientation film adhered to the side of the substrate 10 facing the lower substrate, a sealing portion 140 located between the upper orientation film and the lower orientation film and forming a sealed space with the lower substrate and the substrate 10, and a liquid crystal layer filling the sealed space and containing a spacer material.

[0035] In addition to the substrate 10 serving as a driving backplane, the passive electrophoretic electronic paper display area 200 also includes a protective film 210, an OCA (Optically Clear Adhesive) adhesive layer 220 connected to the protective film 210, a transparent substrate 230 connected to the protective film 210 through the OCA adhesive layer 220 and having a common electrode, an electrophoretic layer (not shown) located between the substrate 10 and the transparent substrate 230, and a seal 250 connected to the edge of the protective film 210 and the substrate 10 and forming a sealed space with the protective film 210 and the substrate 10. The common electrode in the transparent substrate 230 is an indium tin oxide (ITO) electrode.

[0036] During the design, the distance between the passive liquid crystal display area 100 and the passive electrophoretic electronic paper display area 200 is as close as possible to reduce the wiring resistance of the indium tin oxide (ITO) electrode. Metal materials such as molybdenum, aluminum, and molybdenum can also be used to replace ITO. The interface part 30 uses a flexible printed circuit board (FPC) to connect to the external test system board.

[0037] Please refer to Figure 2 , which is a second embodiment of a passive hybrid type display device provided by the present invention, including a passive liquid crystal display area 100, a passive electrophoretic electronic paper display area 200, a driving control chip 20 and an interface part 50 connected to the driving control chip 20.

[0038] The driving backplane of the passive electrophoretic electronic paper display area 200 and the driving backplane of the passive liquid crystal display area 100 share a substrate 40, but the display areas do not overlap. The driving control chip 20 and the interface unit 50 are connected to the substrate 10 or connected to the substrate 10 through a COF packaging method, and apply different driving signals to different types of display areas.

[0039] In this embodiment, the substrate 40 is a PCB substrate.

[0040] The passive electrophoretic electronic paper display area 200 has the same structure as the passive electrophoretic electronic paper display area 200 of the first embodiment of the passive hybrid type display device, and will not be described in detail herein.

[0041] The passive liquid crystal display area 100 includes a liquid crystal box, a liquid crystal layer filled in the liquid crystal box, and a connector 360 connecting the liquid crystal box and the substrate 40 in addition to the substrate 40. The liquid crystal box includes an upper substrate 310, an upper orientation film 320 covering the lower side of the upper substrate 310, a lower substrate 350, a lower orientation film 340 covering the upper side of the lower substrate 350, and a sealing portion 330 located between the upper orientation film 320 and the lower orientation film 340 and forming a sealed space with the upper substrate 310 and the lower substrate 350. Preferably, the liquid crystal layer is mainly TN / STN liquid crystal, and in this case, an upper polarizer needs to be added on the outer side of the upper substrate 310, and a lower polarizer needs to be added on the outer side of the lower substrate 350.

[0042] The upper substrate 310 and the lower substrate 350 are both made of borosilicate glass or a flexible substrate, and have a thickness less than or equal to 0.2 mm, which is beneficial to increase transmittance and reduce the total thickness of the passive hybrid type display device.

[0043] The connecting member 360 is a flexible printed circuit board (FPC), a conductive rubber strip or a metal connector.

[0044] The driving control chip 20 is connected to the substrate 10 by using a COB (Chip On Board) installation form, and the interface 50 is connected to an external test system board by using a flexible printed circuit board (FPC).

[0045] The common substrate material can be glass or a flexible substrate.

[0046] In the first and second embodiments, the number of passive liquid crystal display areas 100 and passive electrophoretic electronic paper display areas 200 can be multiple, and the distribution of multiple passive liquid crystal display areas 100 and passive electrophoretic electronic paper display areas 200 can be arbitrarily combined according to user needs. For example, the passive liquid crystal display area 100 and the passive electrophoretic electronic paper display area 200 can be horizontally tiled, vertically tiled or surrounded by each other, and the display areas of each other do not overlap.

[0047] The passive liquid crystal display area is preferably TN / STN, CHLCD type liquid crystal, and the passive electrophoretic electronic paper display area is preferably an electronic paper film composed of a transparent substrate with common electrodes attached to the electrophoretic layer and an electrophoretic layer, and a black / white or multi-color segment code film.

[0048] Please refer to Figure 3 The present invention also provides a method for driving a passive hybrid type display device, comprising the following steps:

[0049] Step S1 : providing a passive hybrid type display device, wherein the passive hybrid type display device comprises a passive liquid crystal display area 100 , a passive electrophoretic electronic paper display area 200 , a driving control chip 20 , and an interface part 30 or 50 connected to the driving control chip 20 .

[0050] Step S2: The driving control chip 20 is connected to the passive liquid crystal display area 100 and the passive electrophoretic electronic paper display area 200 through multiple driving signal multiplexing units 22. The driving of the passive liquid crystal display area 100 requires an AC waveform signal. The passive electrophoretic electronic paper display area 200 requires a DC negative voltage signal to display white, and requires a DC positive voltage signal to display black. The driving control chip 20 cooperates with multiple driving signal multiplexing units 22 to solve this driving problem well.

[0051] Step S3 : the output terminal of the driving control chip 20 outputs the control signal to the plurality of driving signal multiplexing units 22 .

[0052] Step S4 : the signal loading end of the driving control chip 20 further outputs an AC waveform signal or a DC waveform signal to the plurality of driving signal multiplexing units 22 .

[0053] Step S5: under the action of the control signal, the multiple driving signal multiplexing units 22 selectively output an AC driving signal or a DC driving signal.

[0054] Step S6: The multiple driving signal multiplexing units 22 send the AC driving signal to the passive liquid crystal display area 100 and send the DC driving signal to the passive electrophoretic electronic paper display area 200. In this way, the passive liquid crystal display area 100 and the passive electrophoretic electronic paper display area 200 can be driven separately, so that the passive liquid crystal display area 100 and the passive electrophoretic electronic paper display area 200 can be driven ingeniously, avoiding mutual interference of corresponding driving signals, and effectively reducing costs.

[0055] The AC waveform signal is preferably an AC square wave signal, and the DC waveform signal is preferably a pulsed DC signal.

[0056] Compared with the prior art, the passive hybrid type display device of the present invention includes a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a driving control chip and an interface part connected to the driving control chip, the driving backplane of the passive electrophoretic electronic paper display area and the upper substrate or lower substrate of the passive liquid crystal display area share the same substrate, and the passive liquid crystal display area and the passive electrophoretic electronic paper display area do not overlap, the driving control chip and the interface part are both arranged on the substrate or connected to the substrate through a COF packaging method, the passive liquid crystal display area has a liquid crystal box and a liquid crystal layer filled in the liquid crystal box, the passive electrophoretic electronic paper display area includes a protective film, an OCA glue layer connected to the protective film, a transparent substrate connected to the protective film through the OCA glue layer and having a common electrode, an electrophoretic layer located between the substrate and the transparent substrate, and a seal connected to the edge of the protective film and the substrate and forming a sealed space with the protective film and the substrate. In this way, the product structure is simple, the cost is low, the display diversification can be achieved, and the application range of the product is expanded. The present invention also provides a driving method for a passive hybrid type display device.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement or improvement within the spirit of the present invention is included in the scope of the claims of the present invention. For example, only the type or quantity of the adhesive layer, the type of the electrophoretic layer, the thickness and type of the substrate, the type of the driving backplane, the bonding conditions of each layer, etc. are changed.

Claims

1. A passive hybrid type display device, characterized in that: The invention comprises a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a driving control chip and an interface part connected to the driving control chip, wherein the driving backplane of the passive electrophoretic electronic paper display area shares the same substrate with the upper substrate or the lower substrate of the passive liquid crystal display area, and the passive liquid crystal display area and the passive electrophoretic electronic paper display area do not overlap, the driving control chip and the interface part are both arranged on the substrate or connected to the substrate through a COF packaging method, the passive liquid crystal display area has a liquid crystal box and a liquid crystal layer filled in the liquid crystal box, the passive electrophoretic electronic paper display area comprises a protective film, an OCA adhesive layer connected to the protective film, a transparent substrate connected to the protective film through the OCA adhesive layer and having a common electrode, and a transparent substrate located between the substrate and the transparent substrate. The invention relates to an electrophoretic layer, and a sealing member connected to the edge of the protective film and the substrate and forming a sealed space with the protective film and the substrate. The driving backplane of the passive electrophoretic electronic paper display area and the driving backplane of the passive liquid crystal display area share the same substrate. When the passive liquid crystal display area is driven by a driving control chip, an AC waveform signal is used. When the passive electrophoretic electronic paper display area is driven to display white, a DC negative voltage signal is used, and when the passive electrophoretic electronic paper display area is displayed, a DC positive voltage signal is used. The driving control chip is connected to the passive liquid crystal display area and the passive electrophoretic electronic paper display area through multiple driving signal multiplexing units. The multiple driving signal multiplexing units send the AC driving signal to the passive liquid crystal display area and send the DC driving signal to the passive electrophoretic electronic paper display area.

2. The passive hybrid display device according to claim 1, characterized in that: The liquid crystal box of the passive liquid crystal display area includes an upper substrate, a lower substrate, an upper orientation film covering the side of the upper substrate facing the lower substrate, a lower orientation film attached to the side of the lower substrate facing the upper substrate, and a sealing portion located between the upper orientation film and the lower orientation film and forming a sealed space with the upper substrate and the lower substrate.

3. The passive hybrid type display device according to claim 2, characterized in that: The substrate is a glass substrate or a flexible substrate, and a part of the substrate serves as an upper substrate or a lower substrate.

4. The passive hybrid type display device according to claim 3, characterized in that: The upper substrate or the lower substrate of the passive liquid crystal display area is made of borosilicate glass, and the thickness is less than or equal to 0.55 mm.

5. The passive hybrid type display device according to claim 1, characterized in that: The driving backplane is a PCB substrate, a glass substrate or a flexible substrate.

6. The passive hybrid type display device according to claim 5, characterized in that: The passive liquid crystal display area also includes a connector connecting the liquid crystal box and the substrate, and the connector is a flexible circuit board, a conductive rubber strip or a metal connector. The connector is a flexible circuit board, a conductive rubber strip or a metal connector.

7. The passive hybrid type display device according to claim 5, characterized in that: The upper substrate and the lower substrate of the passive liquid crystal display area may be borosilicate glass or a flexible substrate, with a thickness less than or equal to 0.2 mm.

8. The passive hybrid type display device according to claim 1, characterized in that: The liquid crystal layer is TN / STN liquid crystal or CHLCD liquid crystal. When the liquid crystal layer adopts TN / STN liquid crystal, an upper polarizer is arranged on the outer side of the upper substrate, and a lower polarizer is arranged on the outer side of the lower substrate.

9. The passive hybrid type display device according to claim 1, characterized in that: The number of the passive liquid crystal display area and the passive electrophoretic electronic paper display area can be multiple, and the distribution of the multiple passive liquid crystal display areas and the passive electrophoretic electronic paper display areas can be arbitrarily combined according to user needs.

10. A method for driving a passive hybrid display device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: providing a passive hybrid type display device, wherein the passive hybrid type display device comprises a passive liquid crystal display area, a passive electrophoretic electronic paper display area, a drive control chip, and an interface part connected to the drive control chip; Step S2: the driving control chip is connected to the passive liquid crystal display area and the passive electrophoretic electronic paper display area through a plurality of driving signal multiplexing units; Step S3: the output end of the drive control chip outputs a control signal to a plurality of drive signal multiplexing units; Step S4: the signal loading end of the drive control chip further outputs an AC waveform signal or a DC waveform signal to a plurality of drive signal multiplexing units; Step S5: the plurality of drive signal multiplexing units select to output an AC drive signal or a DC drive signal under the action of the control signal; Step S6: the plurality of driving signal multiplexing units send the AC driving signal to the passive liquid crystal display area, and send the DC driving signal to the passive electrophoretic electronic paper display area.

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