WO2014190656A1

WO2014190656A1 - Display device

Info

Publication number: WO2014190656A1
Application number: PCT/CN2013/085270
Authority: WO
Inventors: 武延兵
Original assignee: 京东方科技集团股份有限公司
Priority date: 2013-05-27
Filing date: 2013-10-16
Publication date: 2014-12-04
Also published as: CN103323972A; CN103323972B

Abstract

Provided is a display device. Same solves the problem of poor adaptability and uncontrollability of transparency of an existing transparent display. The display device comprises: a transparent reflection unit (1), where the reflection unit (1) is provided with a display surface (13) and an opposing surface (14) that are opposite to each other; a display unit (2), where a content displayed by the display unit (2) is projected onto the opposing surface (14) of the reflection unit (1); and, a pass-through scattering switching unit (9), which is arranged on the opposing surface (14) of the reflection unit (1), where the pass-through scattering switching unit (9) is capable of switching between a scattering state and a transparent state, allowing for application of a liquid crystal display screen or of an organic light-emitting diode display screen in the display unit (2).

Description

Display device

Embodiments of the present invention relate to display technologies, and more particularly to a display device that is switchable between a transparent display mode and a non-transparent display mode and that is transparently controllable. Background technique

Recently, with the development of information technology, transparent display technology has attracted more and more people's attention. Transparent display technology has important applications in public display, virtual reality and human-computer interaction. The transparent display device has a certain degree of penetration so that the user can simultaneously see the information displayed on the display and the actual scene behind the display. The transparent display is suitable for buildings, vehicle windows, shop windows, and the like.

The basic principle of a conventional transparent display device is as follows: As shown in FIG. 1, the display unit 2 projects the content onto the reflection plate 12 through the projection unit 3, and the content is incident on the semi-transparent film 11 through the reflection plate 12. In the above, since the semi-transflective film 11 can partially reflect and partially transmit the light incident thereon, the human eye 5 can see the display image reflected by the semi-transparent film 11 (from the display unit 2), or The real scene 4 is seen through the semi-transparent film 11.

The inventors have found that at least the following problems exist in the prior art: In the conventional transparent display device, since the reflectance/transmittance of the transflective film is fixed, the adaptability is poor, the transparency cannot be changed, and only Transparent display mode, you cannot switch between transparent display mode and non-transparent display mode. Summary of the invention

The technical problem to be solved by the embodiments of the present invention includes providing a switchable between transparent display mode and non-transparent display mode and having transparency controllable for the problem that the existing transparent display device has poor adaptability and uncontrollable transparency. Display device.

The technical solution adopted to solve the technical problem of the embodiments of the present invention is a display device, including: a transparent reflecting unit, the reflecting unit has opposite display surfaces and opposite surfaces; and a display unit, the content displayed by the display unit is projected And a transparent scattering switching unit disposed on an opposite surface of the reflective unit, and the transparent scattering switching unit is switchable between a scattering state and a transparent state. In one example, the transmission-scattering switching unit includes a polymer-dispersed liquid crystal film and an electrode for controlling a state of the polymer-dispersed liquid crystal film.

In one example, the electrode is a transparent electrode.

In one example, in the polymer film: the liquid crystal droplets are uniformly distributed in the organic polymer matrix, and the polymer dispersed liquid crystal film is in a transparent state, the liquid crystal droplets, the polymer matrix are refracted The rate is the same.

In one example, the display device further includes a projection unit for projecting the content displayed by the display unit onto the opposite side of the reflective unit.

In one example, the reflecting unit has a plate shape, the projection unit includes a light incident surface of the reflecting unit, and the light incident surface is a convex surface.

In one example, the projection unit includes at least one independent lens.

In one example, the reflecting unit is in the form of a plate or a semi-transflective film.

In one example, the display unit is a liquid crystal display or an organic light emitting diode display. Since the display device of the embodiment of the invention has a transmission scatter switching unit capable of switching between a scattering state and a transparent state, the transparency of the display device can be controlled by controlling the state of the transmission scatter switching unit, thereby realizing the display device Switching between the transparent display mode and the non-transparent display mode. DRAWINGS

1 is a schematic view showing the principle of a conventional transparent display device;

2 is a schematic structural view of a display device according to Embodiment 2 of the present invention; and FIG. 3 is a schematic structural view of a reflection unit according to Embodiment 2 of the present invention.

Wherein the reference numerals are: 1. Reflecting unit; 11, Semi-reverse semi-permeable membrane; 12. Reflecting plate; 13. Display surface; 14. Opposite surface; 2. Display unit; 3. Projection unit; 4. Scenery; Human eye; 9, through the scattering switching unit. detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Example 1:

The embodiment provides a display device, comprising: a transparent reflecting unit, the reflecting unit has a display surface and an opposite surface opposite to each other; and a display unit, the content displayed by the display unit is projected to the opposite of the reflecting unit And a transmissive switching unit disposed on an opposite surface of the reflective unit, and the transmission-scattering switching unit is switchable between a scattering state and a transparent state.

Since the display device of the embodiment of the present invention has a transmissive scattering switching unit capable of switching between a scattering state and a transparent state, control of the transparency of the display device can be realized by controlling the state of the transmission scattering switching unit. That is to say, when the display device needs to be used as a transparent display device, the transmission scattering switching unit is in a transparent state, and at this time, the display device is in a transparent display mode; similarly, when the display device is required to be used as a non-transparent display device The transmission switching unit is in a scattering state. At this time, the display device is in a non-transparent display mode, thereby implementing switching between the transparent display mode and the non-transparent display mode of the display device. It is not difficult to understand that when the transmission switching unit is in between the scattering state and the transparent state, the display device at this time has a corresponding transparency, that is, the display device can be controlled by the transparency of the scattering switching unit. transparency. Example 2:

The present embodiment provides a display device, as shown in FIG. 2, comprising: a transparent reflecting unit 1 having display surfaces 13 and opposite faces 14 opposite to each other; and a display unit 2, the displayed content of which is projected to the reflecting unit The opposite surface 14 of 1 is transmitted through the scattering switching unit 9, as shown, on the opposite surface 14 of the reflecting unit 1, and the transmission-scattering switching unit 9 is switchable between the scattering state and the transparent state.

For example, the transmission-scattering switching unit 9 includes a polymer dispersed liquid crystal (PDLC) and an electrode (not shown) for controlling the state of the polymer-dispersed liquid crystal film. The polymer dispersed liquid crystal film is a film formed by uniformly dispersing minute liquid crystal droplets in a polymer matrix (e.g., it is solid).

The reason why the polymer is dispersed in the liquid crystal film is because it has two states of a scattering state and a transparent state. Specifically, in the scattering state, when light is incident on the polymer dispersed liquid crystal film, since the effective refractive index of the light passing through the liquid crystal droplet is greatly different from the effective refractive index of the polymer, the light is in the liquid crystal droplet and the polymer Multiple reflections and refractions occur at the interface, and the emitted light is scattered. At this time, the polymer dispersed liquid crystal film is opaque; when an electric field is applied to the polymer dispersed liquid crystal film, the liquid crystal molecules are along Orientation of the electric field direction. If the refractive index of the selected liquid crystal is equal to or approximately equal to the refractive index of the polymer, the light is no longer reflected and refracted in the polymer film: the liquid crystal film is directly transmitted, and the polymer is dispersed at this time. The liquid crystal film exhibits a transparent state; when the external electric field is removed, the liquid crystal droplets return to the original uniform dispersion state under the action of the matrix elastic energy, at which time the polymer dispersed liquid crystal film restores the scattering state. It can be seen that the polymer dispersed liquid crystal film has an electrically controlled optical switch characteristic under the action of an electric field, and by changing the magnitude of the applied electric field, the degree of orientation of the liquid crystal molecules can be controlled (that is, the degree of scattering of light is changed), thereby changing the polymer dispersion. The degree of transparency of the liquid crystal film, which in turn changes the transparency of the display device.

In this embodiment, the electric field for controlling the polymer dispersed liquid crystal film is realized by the electrode, and the electrode may be disposed at both ends of the polymer dispersed liquid crystal film. Of course, other design manners may be adopted as long as the polymer dispersed liquid crystal film can be realized. Apply an electric field. It will be appreciated that the electrode may be, for example, a transparent electrode (e.g., a ruthenium electrode).

In this embodiment, the transmission-scattering switching unit 9 may be, for example, a polymer-dispersed liquid crystal film. However, a polymer-dispersed liquid crystal panel that can exhibit a transparent state may also be used, but the polymer-dispersed liquid crystal panel is bulky, which is disadvantageous to the thinness of the display device. Design.

In one example, when the polymer dispersed liquid crystal film is in a transparent state, the liquid crystal droplets and the polymer matrix have the same refractive index. Because at this time, the liquid crystal droplets in the liquid crystal film have no obvious optical interface with the polymer matrix, and constitute a substantially uniform medium, so the incident light hardly scatters, and the polymer dispersed liquid crystal film is transparent, and the transparency is relatively high. high.

As shown in FIG. 2, the content displayed by the display unit 2 is projected onto the opposite surface 14 of the reflecting unit 1, since the light is reflected on the opposite surface 14, so that the human eye 5 can see the display on the reflecting unit 1. Content. The display unit 2 can be, for example, a liquid crystal display or an organic light emitting diode display. Of course, other display screens can meet the requirements. It is not difficult to understand that the higher the resolution of the display unit 2, the better the display effect of the display device is. .

In one example, the display device further includes a projection unit 3 for projecting the content displayed by the display unit 2 onto the opposite face 14 of the reflection unit 1. That is, the function of the projection unit 3 is to project the contents of the display unit 2 onto the opposite face 14, as long as the design can be achieved for this purpose.

As shown in FIG. 2, the projection unit 3 may include at least one independent lens, wherein the projection unit 3 may be a lens or a lens group. The lens or lens group is selected as the projection unit 3 because we can change the projection position on the opposite side by adjusting the positional relationship between the object distance (the distance from the display unit 2 to the projection unit 3) and the focal length (the focal length of the lens or the lens group). The size of the display on the 14th to meet our needs for different size display devices.

It can be understood that the specific lens design and the optical path design can be variously described, and the details of the embodiment of the present invention are met as long as the content on the display unit 2 can be projected onto the opposite surface 14.

It should be further noted that when the content displayed by the display unit 2 is projected on the opposite surface 14 of the reflective unit 1 by the projection unit 3, certain distortion may occur, so to ensure the display effect, the display unit is required. The pixels on the 2 are repaired in a certain amount. The repair is called a correction. The specific correction mode needs to be specifically designed according to different situations. This embodiment is not limited.

In one example, as shown in Fig. 3, the reflecting unit 1 has a plate shape, the projection unit 3 is a light incident surface of the reflecting unit 1, and the light incident surface is a convex surface. That is to say, when the reflecting unit 1 is in the shape of a plate, it is possible to directly process the light incident surface of the reflecting unit 1 without separately adding a lens or a lens group as the projection unit 3, thereby forming a content through which the display unit 2 can be projected. A convex surface on the opposite face 14.

The reflecting unit 1 shown in Fig. 2 and Fig. 3 has a plate shape. In fact, the reflecting unit 1 may also be a transflective film. The reflectivity/transmittance of the transflective film is fixed and transparent display is also possible. However, at this time, the projection unit 3 may be at least one independent lens because the transflective film is thin and is not suitable for processing the entrance surface.

It is obvious that the display device in the above embodiments may further include a driving circuit for polymer-dispersing the liquid crystal film, a control circuit for inputting signals to the display unit, and a power source, which may be separately disposed or integrated, which is not limited herein.

It is to be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the embodiments of the present invention, but the embodiments of the present invention are not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

Claim

A display device, comprising:

a transparent reflecting unit, the reflecting unit having opposite display surfaces and opposite surfaces;

a display unit, the content displayed by the display unit is projected onto an opposite surface of the reflective unit;

The scattering switching unit is disposed on an opposite side of the reflecting unit, and the transparent scattering switching unit is switchable between a scattering state and a transparent state.

The display device according to claim 1, wherein the transmission-scattering switching unit comprises a polymer-dispersed liquid crystal film and an electrode for controlling a state of the polymer-dispersed liquid crystal film.

The display device according to claim 2, wherein the electrode is a transparent electrode.

The display device according to claim 2, wherein in the polymer film: the liquid crystal droplets are uniformly distributed in the organic polymer matrix, and the polymer dispersed liquid crystal film is in a transparent state The liquid crystal droplets and the polymer matrix have the same refractive index.

5. The display device of claim 1, further comprising:

A projection unit for projecting the content displayed by the display unit onto the opposite side of the reflecting unit.

The display device according to claim 5, wherein the reflecting unit has a plate shape, the projection unit includes a light incident surface of the reflecting unit, and the light incident surface is a convex surface.

The display device according to claim 5, wherein the projection unit comprises at least one independent lens.

The display device according to claim 1, wherein the reflecting unit is in the form of a plate or a transflective film.

The display device according to any one of claims 1 to 8, wherein the display unit is a liquid crystal display or an organic light emitting diode display.