CN102681195A - Polarized light transformational structure and display device - Google Patents

Abstract

The invention discloses a polarized light transformational structure and a display device, relating to the technical field of automatic three-dimensional display. The polarized light transformational structure is a blue phase liquid crystal box driven by a transverse electric field and is used for maintaining the polarization direction of the incident linear polarized light or changing the polarization direction by 90 degrees for emergence. The polarized light transformational structure and the display device can realize 2D (two-dimensional)/3D (three-dimensional) mode transformation. Since the blue phase liquid crystal box driven by the transverse electric field is adopted for the polarized light transformational structure, the display effect is improved, the manufacturing process of the device is simplified, and the response time of 2D/3D transformation is shortened.

Description

Polarized light conversion structure and display device

technical field

The invention relates to the technical field of autostereoscopic display, in particular to a polarized light conversion structure and a 2D/3D switchable autostereoscopic display device comprising the structure.

Background technique

Autostereoscopic display refers to the use of optics, microelectronics technology, computer technology, etc., when the stereoscopic left and right eye images acquired on a two-dimensional (2D) display plane are displayed in a three-dimensional (3D) stereoscopic form, that is, manufactured by artificial means. The parallax of the left and right eyes of a person sends two images with parallax to the left and right eyes respectively, so that the brain can produce the feeling of observing a real 3D object after acquiring the different images seen by the left and right eyes. Autostereoscopic display technology is widely used and can greatly improve the reproduction of visual information. Therefore, it has become a hot research topic in the field of display technology in the world.

There are generally two types of autostereoscopic display devices: slit grating type and microlens array type. The microlens array autostereoscopic display device includes a display panel and a microlens array installed in front of the display panel. Through the microlens array, the left and right eyes of a person produce parallax, the left eye sees the picture for the left eye, and the right eye sees the picture for the right eye, thereby Realize 3D display. .

Traditional microlens array stereoscopic display devices cannot realize 2D/3D conversion, which brings great inconvenience to use. In response to this demand, many new studies have emerged. For example: plate a conductive layer on the surface of the lens, use it as an electrode, and add a transparent flat electrode to make a liquid crystal cell, and change the propagation of light by controlling the liquid crystal director to achieve 2D/3D conversion. However, it is very difficult to plate a conductive layer on the surface of the microlens array; moreover, due to the large distance between the microlens array and the flat electrode, the electric field is small, which makes the response time of the liquid crystal long and the 2D/3D switching is difficult.

Contents of the invention

(1) Technical problems to be solved

The technical problem to be solved by the present invention is to provide a display device that can realize 2D/3D conversion, has short conversion response time, and has good display effect.

(2) Technical solution

In order to solve the above problems, the present invention provides a polarized light conversion structure, which is a blue-phase liquid crystal cell driven by a transverse electric field, which is used to output the incident linearly polarized light without changing its polarization direction or changing its polarization direction by 90°. .

Preferably, the blue-phase liquid crystal cell driven by a transverse electric field comprises two substrates and blue-phase liquid crystals filled between the two substrates, and stripes arranged alternately in positive and negative directions are formed on any one of the two substrates. shaped electrodes, the arrangement direction of the electrodes forms an included angle of 45° with the polarization direction of the linearly polarized light incident from the display panel.

The present invention also provides a display device, comprising the above-mentioned polarized light conversion structure.

Preferably, the device further includes: a display panel, configured to output display images, and the output light is linearly polarized light.

Preferably, the device also includes:

The lens assembly is used to act as a flat lens or a convex lens for the outgoing light from the polarized light conversion structure.

Preferably, the lens assembly includes a single-refraction lens and a double-refraction lens, and the curved surfaces of the single-refraction lens and the double-refraction lens match each other.

Preferably, the single refractive index lens is a convex lens array composed of a plurality of convex lenses, and the birefringent index lens is a concave lens array composed of a plurality of concave lenses.

Preferably, the refractive index of the single refractive index lens is equal to one of the two refractive indices of the birefringent index lens and greater than the other of the two refractive indices of the birefringent index lens.

Preferably, the double refraction index lens is a convex lens array composed of a plurality of convex lenses, and the single refraction index lens is a concave lens array composed of a plurality of concave lenses.

Preferably, the refractive index of the single refractive index lens is equal to one of the two refractive indices of the birefringent index lens and smaller than the other of the two refractive indices of the birefringent index lens.

(3) Beneficial effects

The display device of the present invention can realize 2D/3D mode conversion, and because the blue phase liquid crystal cell driven by a transverse electric field is used, the display effect is improved, the preparation process of the device is simplified, and the response time of 2D/3D conversion is shortened.

Description of drawings

FIG. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;

Fig. 2a-Fig. 2b are respectively schematic diagrams of the principle of the display device in embodiment 1 when it is not powered on and powered on;

Fig. 3a-Fig. 3b are respectively schematic diagrams of the principle of the display device in embodiment 2 when it is not powered on and powered on;

Fig. 4a-Fig. 4b are respectively schematic diagrams of the principle of the display device in embodiment 3 when it is not powered on and powered on;

5a-5b are schematic diagrams of the principle of the display device in embodiment 4 when it is not powered and powered on, respectively.

Detailed ways

The display device proposed by the present invention is described in detail as follows with reference to the drawings and embodiments.

The display device of the present invention can be any one known to those skilled in the art, such as OLED, plasma or liquid crystal display device, which is not taken as a limitation to the technical solution of the present invention. The polarized light conversion structure of the present invention is a blue-phase liquid crystal cell driven by a transverse electric field. As shown in FIG. 1 , a display device according to an embodiment of the present invention includes: a display panel 1 , a polarized light conversion structure 2 according to an embodiment of the present invention, and a lens assembly.

In the present invention, the display panel 1 is used to output display images, and the output light is linearly polarized light. The polarized light conversion structure 2 is used to controllably output the linearly polarized light incident from the display panel 1 without changing the polarization direction or with the polarization direction changed by 90°, and make the output light enter the lens assembly. The lens assembly is used to act as a planar lens or a convex lens for the outgoing light from the polarized light conversion structure 2, so as to realize 2D/3D conversion.

Wherein, the lens assembly includes a single-refractive-index lens 5a and a double-refractive-index lens 5b, and its placement position can be: the self-polarized light conversion structure 2 is followed by a single-refractive-index lens 5a, a double-refractive-index lens 5b, or a self-polarized light conversion structure 2 These are the double refraction index lens 5b and the single refraction index lens 5a in this order. The curved surfaces of the single-refractive-index lens 5a and the double-refractive-index lens 5b fit each other, the refractive index of the single-refractive index lens 5a is n1, the refractive indices of the double-refractive index lens 5b are ne and no, and n1 is equal to ne or no, and is greater than or less than another one.

Example 1

As shown in FIGS. 2 a - 2 b , in the display device of this embodiment, the display panel 1 is a display device provided with a polarized light source, which is a mature prior art and will not be repeated here. In this embodiment, the polarized light emitted from the display panel 1 propagates forward in a manner of vibrating parallel to the direction of the paper. In the figure, the straight line represents the direction of light propagation, and the short lines and dots perpendicular to the direction of light propagation represent polarization. The short lines perpendicular to the direction of light propagation indicate the polarization directions that vibrate parallel to the direction of the paper, while the dots indicate the polarization directions that vibrate perpendicular to the direction of the paper.

The polarized light conversion structure 2 is a blue-phase liquid crystal cell driven by a transverse electric field, including two layers of glass substrates 2a, 2b (it can also be any transparent substrate known to those skilled in the art such as quartz substrates) and two layers of glass substrates 2a, 2b The blue-phase liquid crystal 4 filled between them, wherein, on the glass substrate 2a adjacent to the display panel 1, a plurality of strip-shaped electrodes 3 arranged alternately positive and negative are formed (the electrodes 3 can also be formed on the glass substrate 2b, and the following The same is true in the embodiment 2-4), and the arrangement direction of the electrode 3 and the polarization direction of the polarized light incident in the structure form an angle of 45 °, so that when the electrode 3 is powered, the blue phase liquid crystal 4 is in the electric field Under the action, the angle between the director and the polarization direction of the incident polarized light is 45°, the phase delay is half a wavelength, and the polarization direction changes exactly 90°.

The single refractive index lens 5 a is a convex lens array composed of a plurality of convex lenses, the birefringent index lens 5 b is a concave lens array composed of a plurality of concave lenses, and the single refractive index lens 5 a is adjacent to the polarization conversion structure 2 . The birefringence lens 5b further comprises a glass substrate 8 (it can also be any transparent substrate known to those skilled in the art such as a quartz substrate) and a liquid crystal 6 filled between the single refraction lens 5a and the glass substrate 8, and the glass substrate 8 An alignment layer 7 is formed on it, so that the long axis of the liquid crystal 6 is aligned parallel to the glass substrate 8. This is a mature prior art and will not be repeated here. In this embodiment, the liquid crystal 6 is a positive liquid crystal. There is a relationship between the refractive index n1 of the single-refractive-index lens 5a and the refractive indices ne and no of the double-refractive-index lens 5b: n1=ne>no.

As shown in FIG. 2 a , when the electrodes 3 of the polarization conversion structure 2 are not powered, the blue phase liquid crystal 4 is isotropic and does not change the polarization direction of light. The polarized light emitted from the display panel 1 and vibrating parallel to the direction of the paper enters the blue-phase liquid crystal cell driven by the transverse electric field without changing the polarization direction and continues to propagate into the lens assembly. When the light propagates in the single-refractive index lens 5a with a refractive index of n1, and then enters the concave lens formed by the liquid crystal 6, the vibration of the light is along the long axis direction of the liquid crystal molecules, and the concave lens formed by the liquid crystal 6 has a refractive index of ne for the light. Since n1=ne, the propagation direction of light does not change at this time. This is 2D mode.

As shown in FIG. 2 b , when the electrodes 3 of the polarization conversion structure 2 are powered on, the optical axis of the blue phase liquid crystal 4 is aligned along the direction of the electric field. Since the electrode 3 forms an angle of 45° with the polarization direction of the initial polarized light, the angle between the blue phase liquid crystal 4 and the incident polarized light is also 45°. The angle between the optical axis of the blue-phase liquid crystal 4 and the polarization direction of the incident polarized light is 45°, and the phase delay is half a wavelength. Therefore, the polarized light emitted from the display panel 1 and vibrating parallel to the direction of the paper passes through the blue-phase liquid crystal cell driven by a transverse electric field. Changed by 90°, it becomes polarized light vibrating in the direction perpendicular to the paper surface. Enter the lens assembly with this polarization direction, the light propagates in the single refractive index lens 5a of refractive index n1, and then when entering the concave lens formed by the liquid crystal 6, the vibration of the light is along the short axis direction of the liquid crystal 6 molecules, and the concave lens formed by the liquid crystal 6 The index of refraction for this ray is no. Since n1>no, the propagation direction of light changes at this time. Now run 3D mode.

Example 2

As shown in Figures 3a-3b, the structure of the display device of this embodiment is basically the same as that of Embodiment 1, the difference is that the polarization direction of the incident light of the display panel 1 is vertical to that of Embodiment 1, therefore, this embodiment Middle liquid crystal 6 selects negative liquid crystal for use. There is a relationship between the refractive index n1 of the single-refractive-index lens 5a and the refractive indices ne and no of the double-refractive-index lens 5b: n1=no>ne.

As shown in FIG. 3 a , when the electrodes 3 of the polarization conversion structure 2 are not powered, the blue phase liquid crystal 4 is isotropic, and the polarization direction of the light does not change. The polarized light emitted from the display panel 1 and vibrating in the direction perpendicular to the plane of the paper enters the blue-phase liquid crystal cell driven by the transverse electric field without changing the polarization direction and continues to propagate into the lens assembly. The light propagates in the single refractive index lens 5a with a refractive index of n1, and when it enters the concave lens formed by the liquid crystal 6, the vibration of the light is along the short axis direction of the liquid crystal molecules, and then the concave lens formed by the liquid crystal 6 has a refractive index of no for the light. Since n1=no, the propagation direction of light does not change at this time. This is 2D mode.

As shown in FIG. 3 b , when the electrodes 3 of the polarization conversion structure 2 are powered on, the optical axis of the blue phase liquid crystal 4 is aligned along the direction of the electric field. Since the electrode 3 forms an angle of 45° with the polarization direction of the initial polarized light, the angle between the blue phase liquid crystal 4 and the incident polarized light is also 45°. The angle between the optical axis of the blue-phase liquid crystal 4 and the polarization direction of the incident polarized light is 45°, and the phase delay is half a wavelength. Therefore, the polarized light emitted from the display panel 1 and vibrating in the direction perpendicular to the paper surface changes after entering the blue-phase liquid crystal cell driven by a transverse electric field. 90°, it becomes the vibrating polarized light parallel to the direction of the paper. Enter the lens assembly with this polarization direction, the light propagates in the single refractive index lens 5a of refractive index n1, and then when entering the concave lens formed by the liquid crystal 6, the vibration of the light is along the short axis direction of the liquid crystal 6 molecules, and the concave lens formed by the liquid crystal 6 The refractive index of this ray is ne. Since n1>ne, the propagation direction of light changes at this time. Now run 3D mode.

Example 3

As shown in Figures 4a-4b, in the display device of this embodiment, the display panel 1 and the polarization conversion structure 2 are the same as those in the display device of Embodiment 1, and the polarization direction of the incident light of the display panel 1 is also the same as that of the embodiment. Same as in Example 1.

In the display device of this embodiment, the single refractive index lens 5a is a concave lens array composed of a plurality of concave lenses, the birefringent index lens 5b is a convex lens array composed of a plurality of convex lenses, and the birefringent index lens 5b is adjacent to the polarization conversion structure 2 . The double refraction index lens 5b is formed by the liquid crystal 6 that is filled between the glass substrate 8 adjacent to the glass substrate 2b and the single refraction index lens 5a, and an orientation layer 7 is formed on the glass substrate 8 facing the double refraction index lens 5b, so that the liquid crystal The long axis 6 is oriented axially parallel to the glass substrate 8, which is a mature prior art and will not be repeated here. The liquid crystal 6 adopts negative liquid crystal. There is a relationship between the refractive index n1 of the single-refractive-index lens 5a and the refractive indices ne and no of the double-refractive-index lens 5b: n1=ne<no.

As shown in FIG. 4 a , when the electrodes 3 of the polarization conversion structure 2 are not powered, the blue phase liquid crystal 4 is isotropic, and the polarization direction of the light does not change. The polarized light emitted from the display panel 1 and vibrating parallel to the direction of the paper enters the blue-phase liquid crystal cell driven by the transverse electric field without changing the polarization direction and continues to propagate into the lens assembly. The light propagates in the birefringence lens 5b. At this time, the vibration of the light is along the long axis direction of the liquid crystal 6 molecules. Lens 5a. Since ne=n1, the propagation direction of light does not change at this time. This is 2D mode.

As shown in FIG. 4 b , when the electrodes 3 of the polarization conversion structure 2 are powered on, the optical axis of the blue phase liquid crystal 4 is aligned along the direction of the electric field. Since the electrode 3 forms an angle of 45° with the polarization direction of the initial polarized light, the angle between the blue phase liquid crystal 4 and the incident polarized light is also 45°. The angle between the optical axis of the blue-phase liquid crystal 4 and the polarization direction of the incident polarized light is 45°, and the phase delay is half a wavelength. Therefore, the polarized light emitted from the display panel 1 parallel to the direction of the paper passes through the blue-phase liquid crystal cell driven by a transverse electric field, and the polarization direction changes. 90°, it becomes polarized light vibrating in the direction perpendicular to the paper. Enter the lens assembly with this polarization direction, and the light propagates in the birefringence lens 5b. At this time, the vibration of the light is along the short axis direction of the liquid crystal 6 molecules. The refractive index of the birefringence lens 5b to the light is no, and then Enter the single refractive index lens 5a of refractive index n1. Since no>n1, the propagation direction of light changes at this time. Now run 3D mode.

Example 4

As shown in Figures 5a-5b, the structure of the display device of this embodiment is basically the same as that of Embodiment 3, the difference is that the polarization direction of the incident light of the display panel 1 is vertical to that of Embodiment 3, therefore, this embodiment Middle liquid crystal 6 selects positive liquid crystal for use. There is a relationship between the refractive index n1 of the single-refractive-index lens 5a and the refractive indices ne and no of the double-refractive-index lens 5b: n1=no<ne.

As shown in FIG. 5 a , when the electrodes 3 of the polarization conversion structure 2 are not powered, the blue phase liquid crystal 4 is isotropic, and the polarization direction of the light does not change. The polarized light emitted from the display panel 1 and vibrating parallel to the direction of the paper enters the blue-phase liquid crystal cell driven by the transverse electric field without changing the polarization direction and continues to propagate into the lens assembly. The light propagates in the birefringence lens 5b. At this time, the vibration of the light is along the short axis direction of the liquid crystal 6 molecules. Lens 5a. Since no=n1, the propagation direction of light does not change at this time. This is 2D mode.

As shown in FIG. 5 b , when the electrodes 3 of the polarization conversion structure 2 are powered on, the optical axis of the blue phase liquid crystal 4 is aligned along the direction of the electric field. Since the electrode 3 forms an angle of 45° with the polarization direction of the initial polarized light, the angle between the blue phase liquid crystal 4 and the incident polarized light is also 45°. The angle between the optical axis of the blue-phase liquid crystal 4 and the polarization direction of the incident polarized light is 45°, and the phase delay is half a wavelength. Therefore, the polarized light emitted from the display panel 1 and vibrating in the direction perpendicular to the paper plane passes through the blue-phase liquid crystal cell driven by a transverse electric field, and the polarization direction changes. 90°, it becomes polarized light that vibrates parallel to the direction of the paper. Enter the lens assembly with this polarization direction, and the light propagates in the birefringence lens 5b. At this time, the vibration of the light is along the long axis direction of the liquid crystal 6 molecule. The refractive index of the birefringence lens 5b to the light is ne, and then After entering the single refractive index lens 5a with a refractive index of n1. Since ne>n1, the propagation direction of light changes at this time. Now run 3D mode.

In the inventive display device, the single-refraction lens can be formed of transparent hard material, and the double-refraction lens can be nematic liquid crystal, cholesteric liquid crystal or calcite.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (10)

1. a polarized light transformational structure is characterized in that, this polarized light transformational structure is the blue phase liquid crystal box that transverse electric field drives, and is used for the linear polarization light polarization direction of incident is not changed or 90 ° of outgoing of change of polarized direction.

2. polarized light transformational structure as claimed in claim 1; It is characterized in that; The blue phase liquid crystal box that said transverse electric field drives comprises the blue phase liquid crystal of filling between two-layer substrate and the said two-layer substrate; Be formed with the positive and negative strip shaped electric poles of alternately arranging on arbitrary layer in the said two-layer substrate, the orientation of said electrode becomes 45 ° of angles with the polarization direction of the linearly polarized photon of incident.

3. a display device is characterized in that, comprises the described polarized light transformational structure of claim 1.

4. display device as claimed in claim 3 is characterized in that, this device also comprises:

Display panel is used to export display image, and the light of output is linearly polarized photon.

5. display device as claimed in claim 3 is characterized in that, this device also comprises:

Lens subassembly is used for the said emergent light from said polarized light transformational structure is shown as plano lens or convex lens.

6. display device as claimed in claim 5 is characterized in that said lens subassembly comprises single refraction rate lens and refraction of birefringence lens, and the curved surface of said single refraction rate lens and said refraction of birefringence lens agrees with each other.

7. display device as claimed in claim 6 is characterized in that, said single refraction rate lens are the convex lens array that a plurality of convex lens are formed, and said refraction of birefringence lens is the concavees lens array that a plurality of concavees lens are formed.

8. display device as claimed in claim 6 is characterized in that, the refractive index of said single refraction rate lens equals in two refractive indexes of said refraction of birefringence lens, and greater than the another one in two refractive indexes of said refraction of birefringence lens.

9. display device as claimed in claim 6 is characterized in that, said refraction of birefringence lens is the convex lens array that a plurality of convex lens are formed, and said single refraction rate lens are the concavees lens array that a plurality of concavees lens are formed.

10. display device as claimed in claim 9 is characterized in that, the refractive index of said single refraction rate lens equals in two refractive indexes of said refraction of birefringence lens, and less than the another one in two refractive indexes of said refraction of birefringence lens.

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