WO2014139197A1

WO2014139197A1 - Double-sided display panel and double-sided display device

Info

Publication number: WO2014139197A1
Application number: PCT/CN2013/074807
Authority: WO
Inventors: 王新星; 柳在健
Original assignee: 京东方科技集团股份有限公司
Priority date: 2013-03-15
Filing date: 2013-04-26
Publication date: 2014-09-18
Also published as: CN103257474B; CN103257474A

Abstract

A double-sided display panel and a double-sided display device comprising the double-sided display panel. The double-sided display panel comprises a first display subunit and a second display subunit which are arranged back to each other, wherein a coloring substrate (18) is further arranged between the first display subunit and the second display subunit, and is capable of enabling the first display subunit and the second display subunit to display colors simultaneously.

Description

Double-sided display panel and double-sided display device

Embodiments of the present invention relate to a double-sided display panel and a double-sided display device including the double-sided display panel. Background technique

In response to the trend of diversification of display functions, a double-sided display device has been proposed. Double-sided display has many advantages. For example, when a double-sided display device is used as a television signal receiving device at home, it can be embedded in a door frame or a partition wall of an adjacent room, so that people in different rooms can simultaneously acquire the same one. Information or different information.

Currently, the double-sided display device is usually formed by two single-sided display panels, such as a liquid crystal (LC) panel and/or an organic light-emitting diode (OLED) display panel. Formed, even formed using two single-sided display devices that have been separately completed. The double-sided display device formed in this manner can realize double-sided display, but has a large volume, a large thickness, and a large weight.

The development of technology is always displayed, and PDLC (Polymer Dispersed Liquid Crystal) display technology has also appeared. As shown in Figs. 1A and 1B, the PDLC layer is polymerized by polymer 6 (i.e., a prepolymer monomer) and polymerized to obtain a composite of the two. Through the dielectric anisotropy of the liquid crystal molecules, the transition between the dark state/dark state in the energized state and the dark state/bright state in the power-off state can be realized, thereby realizing image display.

1A is a schematic view showing an opaque state of a PDLC layer. When no voltage is applied to the electrode plates 1, 2, the liquid crystal molecules 5 are in an initial disorder state, and the liquid crystal phase does not match the birefringence mode of the polymer phase. The scattering state of the liquid crystal molecule 5 to the incident light 4, the PDLC is in an OFF state; FIG. 1B is a schematic diagram of the transparent state of the PDLC layer, and when a voltage is applied to the electrode plates 1, 2, an electric field is formed between the PDLC layers. At this time, the liquid crystal molecules 5 are formed in an ordered arrangement, such that the birefringence of the liquid crystal phase and the polymer phase match each other, which is expressed as a transmission state of the liquid crystal molecules 5 to the incident light 4, and the incident light 4 can be irradiated through the PDLC layer. To the colored layer 3, the reflected light 7 is formed by the reflection of the colored layer 3 to form an image, and the PDLC is in an ON state. Compared with the conventional liquid crystal display device, the PDLC display device has the advantages of not requiring a polarizer, a manufacturing process, and a wide range of materials, and can be used for making electronic paper books, display panels, glass windows, billboards, etc., and can also be used for production. Flexible, large-sized display device.

As shown in Fig. 2, the Chinese Patent Publication No. CN202330951U discloses a double-sided display device formed by bonding two independent single-sided display devices. The double-sided display device adopts two layers of colored village bottoms (first colored village bottom 10, second colored village bottom 11), two common electrode layers (first common electrode layer 12, second common electrode layer 13, generally ITO transparent electrode layer) as an inner layer, and then a layer of PDLC layer (first polymer dispersed liquid crystal layer 14, second polymer dispersed liquid crystal layer 15) is attached to the outer side of the inner layer, and then the corresponding array substrate is provided. An array substrate 16 and a second array substrate 17) form a double-sided display device. Although the double-sided display device eliminates the disadvantages of the conventional double-sided liquid crystal display device and the double-sided OLED display device to some extent, it is still formed by a single-piece bonding method, and needs to be performed between the layers. The cement is fixed, and the flatness and alignment of each layer will affect the display effect. At the same time, from the viewpoint of image formation mechanism, since the structures of the display devices on both sides are independent, there is no shared portion. Summary of the invention

Embodiments of the present invention provide a double-sided display panel and a double-sided display device including the double-sided display panel, the double-sided display panel having a small thickness, which conforms to the trend of lightening and thinning of electronic products.

An aspect of the present invention provides a double-sided display panel including a first display sub-unit and a second display sub-unit disposed opposite to each other, and between the first display sub-unit and the second display sub-unit A dye base layer is provided, and the dye base layer can simultaneously display colors of the first display subunit and the second display subunit.

For example, the dye base layer is formed by doping dye particles in an organic polymer transparent material.

For example, the dye base layer has a thickness in the range of 0.5 to 2 mm.

For example, the organic polymer transparent material is an acrylic resin, and for example, the dye particles are a monochrome toner or a masterbatch.

For example, the dye particles are uniformly distributed in the transparent material, and the ratio of the dye particles in the transparent material ranges from 0.1 to 5%. Further for example, the first display subunit further includes a first common electrode layer and a second common electrode layer. For example, the first common electrode layer is formed on one side of the dye base layer by a sputtering process, and the second common electrode layer is formed on the other side of the dye base layer by a sputtering process.

For example, the first display subunit further includes a first polymer dispersed liquid crystal layer and a first array substrate, and the first polymer dispersed liquid crystal layer and the first array substrate are respectively formed in the first common by a bonding process The second display subunit further includes a second polymer dispersed liquid crystal layer and a second array substrate, wherein the second polymer dispersed liquid crystal layer and the second array substrate are bonded A process is respectively formed on a side of the second common electrode layer away from the dye base layer.

For example, the liquid crystals in the first polymer dispersed liquid crystal layer and the second polymer dispersed liquid crystal layer are both negative liquid crystals, or both positive liquid crystals, or one of which is a negative liquid crystal and the other is a positive liquid crystal.

Another aspect of the present invention provides a double-sided display device including a display panel and a driving circuit connected to the display panel; the display panel adopting the above-described double-sided display panel.

For example, the first display subunit and the second display subunit respectively have independent driving circuits, and the first display subunit and the second display subunit may display the same image or display at a certain moment. Not the same image. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, rather than to the present invention. limit.

1A and 1B are schematic diagrams showing an opaque state and a light transmitting state of a PDLC layer;

2 is a schematic structural view of a PDLC double-sided display panel of the prior art;

3A and 3B are schematic structural views of a PDLC double-sided display panel according to Embodiment 1 of the present invention; FIG. 4 is a schematic structural view of a PDLC double-sided display device according to Embodiment 1 of the present invention;

5 is a schematic view showing the same screen on both sides of the double-sided display device;

Fig. 6 is a schematic view showing different screens on both sides of the double-sided display device.

Reference mark:

1, 2 - electrode plate; 3 - colored layer; 4 - incident light; 5 - liquid crystal molecule; 6 - polymer; 7 - outgoing light; 10 - first colored village; 11 - second colored village; First common electrode layer; 13 - second common electrode layer; 14 - first polymer dispersed liquid crystal layer; 15 - second polymer dispersed liquid crystal layer; 16 - first array substrate; 17 - second array substrate; 18 - dyed base layer; Particles; 182 - polymer transparent polymeric material; 19 - frame sealant; 20 - drive circuit. detailed description

The technical solutions of the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

Unless otherwise defined, technical terms or scientific terms used herein shall be of the ordinary meaning understood by those of ordinary skill in the art to which the invention pertains. The terms "first", "second" and similar terms used in the specification and claims of the invention are not intended to indicate any order, quantity or importance, but are merely used to distinguish different components. The words "a", "an" or "the" do not mean a quantity limitation, but mean that there is at least one. The words "including" or "comprising", etc., are intended to mean that the elements or objects preceding "including" or "comprising" are intended to encompass the elements or Component or object. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "Down", "Left", "Right", etc. are only used to indicate the relative positional relationship. When the absolute position of the object to be described is changed, the relative positional relationship may also change accordingly.

An embodiment of the present invention provides a double-sided display panel including a first display sub-unit and a second display sub-unit disposed opposite to each other, and between the first display sub-unit and the second display sub-unit A dye base layer is provided, and the dye base layer can simultaneously display colors of the first display subunit and the second display subunit.

Embodiments of the present invention also provide a double-sided display device including the above-described double-sided display panel. Example 1

As shown in FIG. 3A, the first display subunit includes a first common electrode layer 12, a first polymer dispersed liquid crystal layer 14, and a first array substrate 16, which are sequentially disposed, and the second display subunit includes sequentially disposed a second common electrode layer 13, a second polymer dispersed liquid crystal layer 15, and a second array substrate 17, A dye base layer 18 is disposed between the first common electrode layer 12 and the second common electrode layer 13.

As shown in FIG. 3B, the dye base layer 18 is formed by doping the dye particles 181 in the organic polymer transparent material 182 (ie, the dye base layer is similar to a colored organic glass), and the thickness of the dye base layer 18 may be 0.5-2mm.

For example, the organic polymer transparent material 182 is an acrylic resin, and the dye particles 181 are a monochrome toner or a masterbatch. The dye particles are uniformly distributed in the polymer transparent material, and the ratio of the dye particles in the polymer transparent material may range from 0.1 to 5%. In the present embodiment, the monochromatic toner is a black (or other monochromatic) toner, or the monochromatic toner master is a black (or other monochromatic) masterbatch. For example, the finished double-sided display panel can be used for electronic paper display.

In this embodiment, the first polymer dispersed liquid crystal layer 14 and the second polymer dispersed liquid crystal layer

The liquid crystal in 15 is also a negative liquid crystal. When the negative PDLC layer acts as an electric field, the liquid crystal molecules are regularly arranged perpendicular to the electric field, and the refractive indices of the liquid crystal molecules match each other. At this time, the PDLC layer is in a transparent state and shows a bright state; when there is no electric field, the liquid crystal molecules are randomly arranged. Since the refractive index of each liquid crystal molecule is anisotropic, the PDLC layer is in a scattering state, and a dark state is displayed. Therefore, the PDLC layer has remarkable photoelectric characteristics and can be switched in two different optical states of the transmissive state and the scattered state. Meanwhile, compared with the conventional twisted liquid crystal display device, the advantage of using the PDLC layer to prepare the display device is that no polarized light is required. The sheet and the orientation layer are prepared in a single process.

In this embodiment, the manufacturing process of the double-sided display panel may include the following steps:

51) : Provide a dyed substrate.

In this step, the dyed substrate is formed, for example, by a process of adding 0.1 to 5% of an appropriate amount of monochromatic toner or masterbatch in a transparent acrylic resin material.

52): forming a common electrode layer on both sides of the dyed substrate.

In this step, a transparent electrode layer is separately formed on both sides of the dyed substrate, for example, by a double-sided sputtering process. The first common electrode layer 12 may be formed on one side of the dye base layer 18 by a sputtering process, and the second common electrode layer 13 may be formed on the other side of the dye base layer 18 by using a sputtering process. .

53): a PDLC layer and an array substrate are respectively attached to a side of the common electrode layer away from the dye substrate.

In this step, the first polymer dispersed liquid crystal layer 14 and the first array substrate 16 are sequentially laminated on the side of the first common electrode layer 12 away from the dyeing substrate 18, respectively, in the second common electrode layer 13 The second polymer dispersed liquid crystal layer 15 and the second array substrate 17 are sequentially attached to the side away from the dye substrate 18, respectively.

In the Chinese patent with the authorization notice number CN202330951 U, the double-sided display panel has two colored village bottoms and two common electrode layers, and is formed by a seven-time cementing (or bonding) process to form the whole display. The panel includes an eight-layer structure. In this embodiment, the common electrode layer of the double-sided display panel is formed on the dyed substrate by sputtering. In comparison, this embodiment is equivalent to synthesizing two layers of ITO transparent common electrode layers and two colored bases into one dye base layer (the entire display panel can be regarded as including a five-layer structure), so that it can be reduced three times. The bonding process can better avoid the flatness problem caused by the bonding process. Especially for large-size double-sided display panels, the two colored bases and two common electrode layers can be formed into one integral layer to maximize the display effect.

In the double-sided display panel in this embodiment, since the first sub-display unit and the second sub-display unit have a common dye base layer, the preparation process difficulty and production difficulty of the double-sided display panel are greatly reduced, and the double-sided display panel is reduced. The cost of the preparation process and process.

Embodiments also provide a double-sided display device including a display panel and a driving circuit connected to the display panel, the display panel employing the above-described double-sided display panel. The first display subunit and the second display subunit respectively have independent driving circuits, and the first display subunit and the second display subunit display the same image or display different at a certain moment. image.

4 is a schematic structural view of a double-sided display device of the embodiment. The first array substrate 16, the first polymer dispersed liquid crystal layer 14 and the dyed base layer 18 on which the first common electrode layer 12 is disposed are joined by a sealant 19 to form a first display subunit. The second array substrate 17, the second polymer dispersed liquid crystal layer 15 and the dyed base layer 18 on which the second common electrode layer 13 is disposed are joined by a sealant 19 to form a second display subunit. The first display sub-unit and the second display sub-unit are respectively connected to and connected to the respective driving circuits 20 by a conductive structure such as a gold ball or a silver paste, and then sealed, thereby obtaining a double-sided PDLC display device. The double-sided display device has two independent input ports, and the two input ports can input the same signal or different signals, and correspondingly display the same image information or different image information.

The drive circuit 20 for the first and second display subunits can employ any suitable drive circuit as desired, for example.

Fig. 5 is a schematic view showing the same screen on both sides of the double-sided display device. At this time, corresponding to The drive port of the first display subunit and the drive port of the second display subunit input the same signal source, and the same image information is simultaneously transmitted to the first display subunit and the second display subunit for display.

Fig. 6 is a schematic view showing different screens on both sides of the double-sided display device. At this time, different signal sources are input corresponding to the driving port of the first display subunit and the driving port of the second display subunit, and different image information is respectively transmitted to the first display subunit and the second display subunit for display. This type of drive is typically used for medical instruments, teaching equipment or double-sided panels, and other locations where double-sided display is required.

The double-sided display device of the embodiment can maintain strict consistency between the first display sub-unit and the second display sub-unit under the same signal due to the use of the common dye base layer, so that the same double-sided display The viewer of the different side display surfaces of the device obtains the same visual experience; at the same time, the double-sided display device can also make the number of layers of the double-sided display panel less, and correspondingly, the thickness of the double-sided display device is also small, thereby ensuring the product. Quality, in line with the current trend of thin and light electronic products.

Example 2:

The difference between this embodiment and the embodiment 1 is that the liquid crystals in the first polymer dispersed liquid crystal layer and the second polymer dispersed liquid crystal layer of the double-sided display panel in this embodiment are both positive liquid crystals.

In this embodiment, the positive PDLC layer is in a transparent state when it has an electric field, and is in a scattering state when there is no electric field. When an electric field is applied, the liquid crystal molecules are regularly arranged parallel to the electric field, and the refractive indices of the liquid crystal molecules are matched. At this time, the PDLC layer is in a transparent state and shows a bright state; when there is no electric field, the liquid crystal molecules are randomly arranged due to the liquid crystal molecules. The refractive index is anisotropic, and the PDLC layer is in a scattering state, showing a dark state.

This embodiment also provides a double-sided display device including the above double-sided display panel.

The other configurations of the double-sided display panel and the double-sided display device in this embodiment are the same as those in the first embodiment, and will not be described herein.

Example 3:

The difference between this embodiment and the first and second embodiments is that the liquid crystal in the first polymer dispersed liquid crystal layer and the second polymer dispersed liquid crystal layer of the double-sided display panel in the embodiment is a negative liquid crystal and the other is Positive liquid crystal.

In this embodiment, the negative PDLC layer and the positive PDLC layer have an electric field and no electric field. The following working state analysis refers to Embodiments 1, 2, respectively, and details are not described herein again.

Embodiment 1-3 provides a double-sided display panel and a double-sided display device, which greatly reduces the thickness of the product, and also avoids display defects caused by uneven bonding caused by excessive number of layers, and makes the display device light and thin. It guarantees the strict consistency of the double-sided display color and the display effect is better.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

Claim

1. A double-sided display panel comprising:

a first display subunit and a second display subunit that are opposite to each other, and

a dye base layer disposed between the first display subunit and the second display subunit, wherein the dye base layer can simultaneously display colors of the first display subunit and the second display subunit.

The double-sided display panel according to claim 1, wherein the dye base layer is formed by doping dye particles in an organic polymer transparent material.

The double-sided display panel according to claim 2, wherein the dye base layer has a thickness ranging from 0.5 to 2 mm.

The double-sided display panel according to claim 2, wherein the organic polymer transparent material is an acrylic resin, and the dye particles are a monochrome toner or a masterbatch.

The double-sided display panel according to claim 2, wherein the dye particles are uniformly distributed in the organic polymer transparent material, and the ratio of the dye particles in the organic polymer transparent material is 0.1 %-5%.

The double-sided display panel according to any one of claims 1 to 5, wherein the first display sub-unit includes a first common electrode layer and a second common electrode layer.

The double-sided display panel according to claim 6, wherein the first display sub-unit further comprises a first polymer dispersed liquid crystal layer and a first array substrate, the first polymer dispersed liquid crystal layer and the first The array substrate is respectively formed on a side of the first common electrode layer away from the dye base layer by a bonding process;

The second display subunit further includes a second polymer dispersed liquid crystal layer and a second array substrate, wherein the second polymer dispersed liquid crystal layer and the second array substrate are respectively formed on the second common electrode layer by a bonding process Keep away from the side of the dyed substrate.

The double-sided display panel according to claim 7, wherein the liquid crystal in the first polymer dispersed liquid crystal layer and the second polymer layer is a negative liquid crystal, or is a positive liquid crystal. Or one of them is a negative liquid crystal and the other is a positive liquid crystal.

A double-sided display device comprising a display panel and a drive circuit connected to the display panel, wherein the display panel employs the double-sided display panel according to any one of claims 1-8.

The double-sided display device according to claim 9, wherein the first display sub-unit and the second display sub-unit respectively have independent driving circuits, and the first display sub-unit and the second The display subunit displays the same image at a certain time or displays a different image.