The application claims priority to the Chinese patent application No. 201910701183.2 filed on Jul. 31, 2019, the entire disclosure of which is incorporated herein by reference as part of the present application.
Embodiments of the present disclosure relate to a transparent display device and a backlight module.
A transparent display device is a display device that images displayed on the transparent display device and scenarios or articles behind the transparent display device can be seen simultaneously by users. Thus, the transparent display device can achieve the integration and interaction of the images displayed on the transparent display device and scenarios or articles behind the transparent display device, so as to offer users a completely new, abundant visual experience of strong presentation.
The transparent display device can be not only applied in common electronic equipment such as mobile phones, televisions and computers, but also in products such as automobile windows, refrigerator doors, shop windows, vending machines, and building windows.
Embodiments of the present disclosure provide a transparent display device and a backlight module. The transparent display device includes a backlight module and a scattering type display panel; the backlight module includes a first wedge light guide plate, the scattering type display panel includes a plurality of pixels. The first wedge light guide plate includes a first light incident surface, a first light emitting surface and a first inclined plane arranged oppositely to the first light emitting surface. The scattering type display panel is located on a side of the first wedge light guide plate where the first light emitting surface is located, each of the plurality of pixels is configured to switch between a transparent state and a scattering state. The transparent display device can be improved in the display uniformity, contrast ratio and display brightness while achieving transparent display.
At least one embodiment of the present disclosure provides a transparent display device. The transparent display device includes: a backlight module, including a first wedge light guide plate; and a scattering type display panel, including a plurality of pixels; the first wedge light guide plate includes a first light incident surface, a first light emitting surface, and a first inclined surface arranged oppositely to the first light emitting surface, an included angle between the first light emitting surface and the first inclined surface is an acute angle, the scattering type display panel is located on a side of the first wedge light guide plate where the first light emitting surface is located, and each of the plurality of pixels is configured to switch between a transparent state and a scattering state.
For example, in the transparent display device provided by an embodiment of the present disclosure, the first light emitting surface is a flat surface, and the first wedge light guide plate has a refractive index in a range from 1.45 to 2.
For example, in the transparent display device provided by an embodiment of the present disclosure, the transparent display device further includes a transparent layer, located between the scattering type display panel and the backlight module, the transparent layer is in direct contact with the first light emitting surface and the scattering type display panel respectively, and the transparent layer has a refractive index in a range from 1.30 to 1.50.
For example, in the transparent display device provided by an embodiment of the present disclosure, the transparent layer has a thickness in a range from 0.05 mm to 0.50 mm.
For example, in the transparent display device provided by an embodiment of the present disclosure, the backlight module further includes a second wedge light guide plate, including a second inclined surface, the first wedge light guide plate and the second wedge light guide plate are disposed at an interval, and the first inclined surface is arranged to be opposite to and approximately parallel to the second inclined surface.
For example, in the transparent display device provided by an embodiment of the present disclosure, the interval between the first wedge light guide plate and the second wedge light guide plate is an air interval.
For example, in the transparent display device provided by an embodiment of the present disclosure, the second wedge light guide plate further includes a second light incident surface which is arranged oppositely to the second inclined surface and is approximately parallel to the first light incident surface, and an included angle between the second light incident surface and the second inclined surface is an acute angle.
For example, in the transparent display device provided by an embodiment of the present disclosure, the transparent display device further includes a light source, arranged on the first light incident surface of the first wedge light guide plate and configured to emit light into the first wedge light guide plate from the first light incident surface, the first wedge light guide having a gradually decreased thickness from the a side where the light source is arranged to an opposite side; the light source has a light emitting half-angle in a range from 30 degrees to 65 degrees.
For example, in the transparent display device provided by an embodiment of the present disclosure, the first light incident surface is configured to receive the light emitted from the light source, the first inclined surface is configured to enable the light emitted from the light source to be totally reflected at the first inclined surface, and the first light emitting surface is configured to enable the light emitted from the light source to be emitted.
For example, in the transparent display device provided by an embodiment of the present disclosure, the light source includes a field sequential light source.
For example, in the transparent display device provided by an embodiment of the present disclosure, the scattering type display panel further includes an array substrate, including a first base substrate and a plurality of pixel electrodes arranged on the first base substrate; an opposed substrate, cell-assembled with the array substrate; and a liquid crystal layer, located between the array substrate and the opposed substrate; the liquid crystal layer includes polymer stabilized liquid crystal or polymer dispersed liquid crystal, each of the plurality of pixel electrodes is configured to drive the polymer stabilized liquid crystal or the polymer dispersed liquid crystal to switch between a transparent state and a scattering state.
For example, in the transparent display device provided by an embodiment of the present disclosure, the opposed substrate includes a second base substrate which has a refractive index in a range from 1.45 to 2.
For example, in the transparent display device provided by an embodiment of the present disclosure, a shape of a cross section of the first wedge light guide plate is a trapezoid, a long base edge of the trapezoid is in a range from 1 mm to 10 mm, and a short base edge of the trapezoid is in a range from 0.1 mm to 2 mm.
At least one embodiment of the present disclosure further provides a backlight module, which includes a first wedge light guide plate, including a first light incident surface, a first light emitting surface, and a first inclined surface arranged oppositely to the first light emitting surface, an included angle between the first light emitting surface and the first inclined surface being an acute angle; and a second wedge light guide plate including a second inclined surface; the first wedge light guide plate and second wedge light guide plate are disposed at an interval, and the first inclined surface is arranged to be opposite to and approximately parallel to the second inclined surface.
For example, in the backlight module provided by an embodiment of the present disclosure, the interval between the first wedge light guide plate and the second wedge light guide plate is an air interval.
For example, in the backlight module provided by an embodiment of the present disclosure, the second wedge light guide plate further includes a second light incident surface arranged oppositely to the second inclined surface and is approximately parallel to the first light incident surface, and an included angle between the second light incident surface and the second inclined surface is an acute angle.
For example, in the backlight module provided by an embodiment of the present disclosure, the first light emitting surface is a flat surface, and the wedge light guide plate has a refractive index in a range from 1.45 to 2.
For example, in the backlight module provided by an embodiment of the present disclosure, the first light emitting surface is provided with no mesh dot.
For example, in the backlight module provided by an embodiment of the present disclosure, a shape of a cross section of the first wedge light guide plate is a trapezoid, a long base edge of the trapezoid is in a range from 1 mm to 10 mm, and a short base edge of the trapezoid is in a range from 0.1 mm to 2 mm.
For example, in the backlight module provided by an embodiment of the present disclosure, the backlight module further includes a light source, arranged on the first light incident surface of the first wedge light guide plate and is configured to emit light into the first wedge light guide plate from the first light incident surface; the first light incident surface being configured to receive the light emitted from the light source; the first inclined surface being configured to enable the light emitted from the light source to be totally reflected at the first inclined surface; and the first light emitting surface being configured to enable the light emitted from the light source to be emitted.
In order to more clearly illustrate the technical solution of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described in the following. It is obvious that the described drawings below are only related to some embodiments of the present disclosure without constituting any limitation thereto.
In order to make objectives, technical details and advantages of the embodiments of the present disclosure more clearly, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the present disclosure. Apparently, the described embodiments are just a part but not all of the embodiments of the present disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the present disclosure.
Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms “first,” “second,” etc., which are used in the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. Also, the terms “comprise,” “comprising,” “include,” “including,” etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects. The phrases “connect”, “connected”, etc., are not intended to define a physical connection or mechanical connection, but may comprise an electrical connection, directly or indirectly.
A transparent display device may include: (1) a transparent display device based on a conventional liquid crystal display panel; (2) a transparent display device based on a light-emitting diode (LED) display panel; (3) a transparent display device based on an organic light-emitting diode (OLED) display panel; and (4) a transparent display device based on a scattering type display panel. In the study, inventor(s) of the present application have noted that because the conventional liquid crystal display panel includes film layers such as polarizers, light transmittance of the transparent display device based on conventional liquid crystal display panel is less than 10%, and the brightness and utilization of light of the transparent display device based on conventional liquid crystal display panel is relatively low; because the size of the light-emitting diode is relatively large, a size of the pixel of the transparent display device based on light-emitting diode display panel is suitable for an oversized transparent display device. Additionally, the transparent display device based on organic light-emitting diode (OLED) display panel has a high cost and a service life difficult to guarantee. Because field sequential light source matching and quick response liquid crystals (for example, polymer-dispersed liquid crystals and polymer stabilized liquid crystals) are used in the scattering type transparent display technology without polarizers and color filters, the transparent display device based on scattering type display panel has a high transmittance (more than 80%); and has the similar manufacture process to conventional liquid crystal display panels, with a low cost, relatively high reliability and relatively long service life.
The light incident mode of this type of transparent display device based on scattering type display panel usually adopts a lateral light incident mode and a projection type light incident mode.
At least one embodiment of the present disclosure provides a transparent display device. The transparent display device includes a backlight module including a first wedge light guide plate, and a scattering type display panel including a plurality of pixels. The first wedge light guide plate includes a first light incident surface, a first light emitting surface and a first inclined plane arranged oppositely to the first light emitting surface. The scattering type display panel is located on a side of the first wedge light guide plate where the first light emitting surface is located, each of the plurality of pixels is configured to switch between a transparent state and a scattering state. The transparent display device can be improved in the display uniformity, contrast ratio and display brightness while achieving transparent display.
At least one embodiment of the disclosure further provides a backlight module, which includes a first wedge light guide plate and a second wedge light guide plate. The first wedge light guide plate includes a first light incident surface, a first light emitting surface, and an inclined surface arranged oppositely to the first light emitting surface, and the second wedge light guide plate includes a second inclined surface, the first wedge light guide plate and the second wedge light guide plate are disposed at an interval, the first inclined surface is arranged to be opposite to and be approximately parallel to the second inclined surface. The backlight module can be used for the transparent display device, and can avoid the deviation and deformation of scenarios and articles behind the transparent display device while improving the display uniformity, contrast ratio and display brightness.
Hereinafter, the transparent display device and backlight module provided by embodiments of the disclosure will be described in detail with reference to the drawings.
In some examples, as illustrated by
In the transparent display device provided in the embodiment, on the first light incident surface is arranged a light source emitting light which can enter the first wedge light guide plate from the first light incident surface. A portion of the light from the first light incident surface is emitted directly from the first light emitting surface, and the other portion of the light is emitted to an end of the first wedge light guide plate away from the first light incident surface through the total reflection by the first inclined surface and is emitted from the first light emitting surface on the end of the first wedge light guide plate away from the first light incident surface. Therefore, the first wedge light guide plate can improve the light emitting uniformity of the backlight module without scattering sheet and light uniformity plate arranged. The light emitted from the first light emitting surface enters directly the scattering type display panel, passes directly through the pixels when the pixels is in a transparent state, and is scattered at the pixels when the pixels is in a scattering state. The scattered light can be emitted from the scattering type display panel, thus displaying images on the side of the scattering type display panel away from the first wedge light guide plate. At the same time, the light emitted or reflected by the scenarios or articles on the side of the first wedge light guide plate away from the scattering type display panel can be emitted from the first inclined surface of the first wedge light guide plate into the first wedge light guide plate and the scattering type display panel, and then can be emitted from the scattering type display panel, thus achieving transparent display on the side of the scattering type display panel away from the first wedge light guide plate. Thus, the transparent display device can be improved in the display uniformity, contrast ratio and display brightness while achieving transparent display.
In some examples, as illustrated by
For example, the material of the first wedge light guide plate 110 is selected from materials of high light transmittance (for example, materials of light transmittance of more than 90%), such as, polymethylmethacrylate (PMMA), acrylic, polycarbonate or glass.
For example, the first wedge light guide plate 110 has materials selected from glass with the refractive index of 1.51314.
In some examples, as illustrated by
In some examples, as illustrated by
In some examples, the material of the transparent layer 310 can be transparent optical glue such as liquid transparent optical glue.
In some examples, the transparent layer 310 has a thickness in a range from 0.05 mm to 0.50 mm; further, the transparent layer 310 has a thickness in a range from 0.08 mm to 0.12 mm.
In some examples, as illustrated by
In the transparent display device provided in the example, there is the second wedge light guide plate arranged, the first inclined surface is arranged to be opposite to and approximately parallel to the second inclined surface, and the light emitted or reflected by the scenarios or articles on a side of the second wedge light guide plate away from the scattering type display panel can firstly pass through the second wedge light guide plate and the first wedge light guide plate, then is emitted again to the scattering type display panel and is emitted out from the scattering type display panel; which makes it possible for the scenarios or articles on a side of the second wedge light guide plate away from the scattering type display panel to have only extremely small position offset and even no position offset after passing through the transparent display device, thus enhancing the display quality of the transparent display device.
In some examples, as illustrated by
In some examples, as illustrated by
For example, the first included angle between the first inclined surface 113 and the first light emitting surface 112 is approximately equal to the second included angle 220 between the second inclined surface 123 and the second light incident surface 121.
In some examples, as illustrated by
For example, it is seen from
In some examples, as illustrated by
In some examples, as illustrated by
For example, the first light incident surface 111 has a size of 3 mm in the direction vertical to the first light emitting surface 112, and the first light emitting surface 112 has a size of 120 mm in the direction vertical the first light incident surface 111. The first wedge light guide plate 110 further includes the first top surface 114 opposite to the first light incident surface 111, and the first top surface 114 has a size of 0.5 mm in the direction vertical to the first light emitting surface 112.
For example, a second base substrate 221 has a refractive index in a range from 1.45 to 2.
In some examples, as illustrated by
For instance, the first base substrate 211 can be made from the same materials as and has the same refractive index as the second base substrate 221.
In some examples, as illustrated by
In some examples, as illustrated by
For example, the first base substrate and second base substrate can be glass substrate, quartz substrate, etc. The first base substrate has a thickness in the range from 300 to 1000 micron, and the second base substrate has a thickness in the range from 300 to 1000 micron.
For example, the pixel electrode and common electrode can be made from transparent oxide semiconductor materials such as indium tin oxide (ITO). When the pixel electrodes and common electrode are made from indium tin oxide, the pixel electrodes have a thickness in the range from 0.02 micron to 0.1 micron, and the common electrode has a thickness in the range from 0.02 micron to 0.1 micron.
For example, the first alignment layer and the second alignment layer can be made from polyimide materials, the first alignment layer has a thickness in the range from 0.05 micron to 0.12 micron, and the second alignment layer has a thickness in the range from 0.05 micron to 0.12 micron.
In an example of the disclosure is provided a transparent display device. The first light incident surface of the first wedge light guide plate used in the transparent display device has a size of 4 mm in the direction vertical to the first light emitting surface. The first light emitting surface has a size of 120 mm in the direction vertical to the first light incident surface, and the first top surface has a size of 1 mm in the direction vertical to the first light emitting surface. Here, the uniformity in the direction of light propagation can be used for the analysis of the brightness uniformity of the transparent display device. According to simulation results, the transparent display device has an optical power of 1814 W in a range of 5 mm from a far light source in the display area, an optical power of 1766 W in a range of 5 mm from the middle region in the display area, and an optical power of 1615 W in a range of 5 mm from a near light source in the display area. It is roughly estimated from this that the transparent display device has a display brightness uniformity of 1615/1814=89% which is remarkably higher than that of the transparent display device with lateral light incidence. Moreover, according to verification results (tested by the CA210 instrument) obtained by using wedge roughly-machined PMMA (polymethylmethacrylate) as the first wedge light guide plate, the transparent display device can achieve the display effect of the brightness of more than 180 nit. It can be seen that the transparent display device provided in the embodiments of the disclosure has a high display brightness uniformity and high display brightness.
As illustrated by
As illustrated by
In some examples, the transparent display device can be electric products with display function such as cellphones, notebook computers and tablet computers. Additionally, the transparent display device can also be products such as automobile windows, refrigerator doors, shop windows, vending machines and building windows.
In some examples, as illustrated by
The backlight module provided in the embodiment on the one hand can improve the uniformity of light emitting intensity so as to enhance the display uniformity and contrast ratio of the transparent display device using the backlight module, and on the other hand can be used for transparent display and makes it possible for the scenarios or articles on a side of the second wedge light guide plate away from the display panel (for example, the scattering type display panel described above) to have only extremely small position offset and even no position offset after passing through the transparent display device, thus enhancing the display quality of the transparent display device using the backlight module.
In some examples, as illustrated by
In some examples, as illustrated by
For example, the first included angle between the first inclined surface 112 and the first light emitting surface 112 is approximately equal to the second included angle 220 between the second inclined surface 123 and the second light incident surface 121.
In some examples, as illustrated by
In some examples, as illustrated by
For example, the first light incident surface 111 has a size of 3 mm in the direction vertical to the first light emitting surface 112, and the first light emitting 112 has a size of 120 mm in the direction vertical the first light incident surface 111. The first wedge light guide plate 110 further includes the first top surface 114 opposite to the first light incident surface 111, and the first top surface 114 has a size of 0.5 mm in the direction vertical to the first light emitting surface 112.
In some examples, as illustrated by
For example, the material of the first wedge light guide plate 110 is selected from materials of high light transmittance (for example, materials of light transmittance of more than 90%), such as, polymethylmethacrylate (PMMA), acrylic, polycarbonate or glass.
For example, the first wedge light guide plate 110 has materials selected from glass with a refractive index of 1.51314.
In some examples, the second wedge light guide plate 120 is made from the same materials as and has the same refractive index as the first wedge light guide plate 110.
In some examples, the second wedge light guide plate 120 can have the same shape as the first wedge light guide plate 110.
In some examples, as illustrated by
The following points need to be noted:
(1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures may refer to the common design(s).
(2) In case of no conflict, features in one embodiment or in different embodiments of the present disclosure can be combined.
The above are merely particular embodiments of the present disclosure but are not limitative to the scope of the present disclosure; any of those skilled familiar with the related arts can easily conceive variations and substitutions in the technical scopes disclosed by the present disclosure, which should be encompassed in protection scopes of the present disclosure. Therefore, the scopes of the present disclosure should be defined in the appended claims.
Number | Date | Country | Kind |
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201910701183.2 | Jul 2019 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/105162 | 7/28/2020 | WO | 00 |