CN102540558A - 2D/3D (Two-dimensional/three-dimensional) switchable auto-stereoscopic display device based on blue phase liquid crystal lens - Google Patents

Abstract

The invention discloses a 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens. The device comprises two parts, a blue-phase liquid crystal lens and a 2D display screen, and the blue-phase liquid crystal lens is placed directly above the 2D display screen. The blue phase liquid crystal lens comprises an upper substrate glass layer, an upper substrate ITO transparent curved electrode, an upper substrate polymer layer, a blue phase liquid crystal layer, a lower substrate ITO transparent plane electrode, and a lower substrate glass layer. The 2D/3D switchable autostereoscopic display device based on the blue phase liquid crystal lens of the present invention can realize the switching between 2D mode and 3D mode in the autostereoscopic display through voltage control: when the upper substrate ITO transparent arc electrode and the lower substrate ITO transparent When there is no voltage between the planar electrodes, the 2D display screen displays 2D images without parallax, and the device works in 2D mode at this time; when a voltage is applied between the ITO transparent arc electrodes on the upper substrate and the ITO transparent planar electrodes on the lower substrate, 2D The display screen displays left and right parallax 2D images, and the device works in 3D mode at this time.

Description

2D/3D switchable autostereoscopic display device based on blue-phase liquid crystal lens

technical field

The present invention relates to the field of display, more specifically, the present invention relates to the field of autostereoscopic display, especially a 2D/3D (two-dimensional/three-dimensional) switchable autostereoscopic display device based on a blue-phase liquid crystal lens.

Background technique

Autostereoscopic display technology is a naked-view 3D display technology. Based on the principle of binocular parallax, it sends the left and right parallax images displayed on the 2D display screen to the left and right eyes of the viewer through the slit grating or cylindrical lens grating installed in front of the 2D display screen. Stereoscopic perception is obtained after brain fusion. The slit grating is composed of light-transmitting strips and light-blocking strips of a certain size arranged alternately, and the separation of parallax images is obtained through their light-transmitting and shielding effects; the cylindrical lens grating is composed of a certain-sized cylindrical lens array, and parallax images are obtained through their refraction separation. Lenticular autostereoscopic displays have attracted much attention due to their simple structure, easy implementation, no need to wear glasses and other visual aids, and good 3D display effects.

Lenticular autostereoscopic displays have problems such as low 3D image resolution, low brightness (especially slit grating autostereoscopic displays), viewing fatigue, and crosstalk of 3D images, making it difficult to popularize them in 3D displays. And, because the source of 3D film is relatively few at present, its production is also complicated, so most of the image information can only be displayed by the 2D display. 2D/3D switchable technology can realize the compatibility of 2D mode and 3D mode on one display, so that users can switch to 3D mode or display 2D mode and 3D mode on the same screen when watching traditional 2D images. Using liquid crystal slit gratings instead of traditional slit gratings can realize 2D/3D switching of autostereoscopic displays, but there is still the problem of low brightness of 3D images. The combination of liquid crystal lens and 2D display can realize 2D/3D switching of autostereoscopic display: when there is a refractive index difference between the center and edge of the liquid crystal lens unit, the display works in 3D mode; when there is no refractive index difference between the center and the edge of the liquid crystal lens unit , the monitor works in 2D mode. The use of liquid crystal lenses will not significantly reduce the brightness of image display, but because the liquid crystal lens uses traditional liquid crystal materials, its response speed is relatively slow, and it only works on incident light of a specific polarization state. The blue phase is a new liquid crystal phase state. The working principle of the blue phase liquid crystal is based on the Kerr effect. It has the advantages of fast response speed, polarization-independent, and no alignment layer, etc., and its development prospect is good.

Contents of the invention

The present invention proposes a 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens, as shown in Figure 1, which includes a blue-phase liquid crystal lens (1) and a 2D display screen (2), and a blue-phase liquid crystal lens ( 1) Place it directly above the 2D display screen (2). The blue-phase liquid crystal lens (1) includes an upper substrate glass layer (3), an upper substrate ITO (indium tin oxide) transparent curved electrode (4), an upper substrate polymer layer (5), and a lower substrate ITO transparent flat electrode (7) . A blue-phase liquid crystal layer (6) and a lower substrate glass layer (8) placed between the upper substrate polymer layer (5) and the lower substrate ITO transparent planar electrode (7), which are closely arranged. The blue-phase liquid crystal lens (1) is composed of a series of blue-phase liquid crystal lens units, and each blue-phase liquid crystal lens unit and each upper substrate ITO transparent arc-shaped electrode unit have the same pitch w .

Preferably, the upper substrate glass layer (3), the lower substrate glass layer (8) and the upper substrate polymer layer (5) are index matched.

Preferably, the pitch w satisfies the formula

w = mQW _p ／( Q + W _p ) (1)

Among them, m is the number of viewpoints in the 3D mode, Q is the interpupillary distance of human eyes, and W _p is the sub-pixel width of the 2D display screen.

Description of drawings

Accompanying drawing 1 is the structural diagram of the 2D/3D switchable autostereoscopic display device based on the blue phase liquid crystal lens of the present invention.

Accompanying drawing 2 is the 2D/3D switchable autostereoscopic display device based on the blue-phase liquid crystal lens of the present invention in the viewing area distribution diagram of viewpoints in 3D mode. Among them, FIG. 2( a ) is a viewing area distribution diagram of viewpoint 1, and FIG. 2( b ) is a viewing area distribution diagram of viewpoint 2.

Accompanying drawing 3 is a 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens of the present invention in 3D mode, a brightness distribution diagram of viewpoints.

The pictorial symbols in the above-mentioned drawings are:

1. Blue phase liquid crystal lens, 2. 2D display screen, 3. Upper substrate glass layer, 4. Upper substrate ITO transparent arc electrode, 5. Upper substrate polymer layer, 6. Blue phase liquid crystal layer, 7. Lower substrate ITO Transparent planar electrode, 8. Lower substrate glass layer.

Detailed ways

A typical embodiment of the 2D/3D switchable autostereoscopic display device based on the blue-phase liquid crystal lens proposed by the present invention will be described in detail below, and the present invention will be further described in detail. It is necessary to point out that the following examples are only used for further description of the present invention, and cannot be interpreted as limiting the protection scope of the present invention, and those skilled in the art make some non-essential improvements to the present invention according to the above-mentioned content of the present invention And adjustments still belong to the protection scope of the present invention.

A 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens, as shown in Figure 1, it includes a blue-phase liquid crystal lens (1) and a 2D display screen (2), and the blue-phase liquid crystal lens (1) is placed Directly above the 2D display screen (2), the distance between the 2D display screen (2) and the blue-phase liquid crystal lens (1) is equal to 0. The 2D display screen (2) adopts a 10.1-inch flat-panel 2D display screen with a resolution of 1024×600. Its sub-pixel width W _p =51 μm.

The blue-phase liquid crystal lens (1) includes an upper substrate glass layer (3), an upper substrate ITO (indium tin oxide) transparent curved electrode (4), an upper substrate polymer layer (5), and a lower substrate ITO transparent flat electrode (7) . A blue-phase liquid crystal layer (6) and a lower substrate glass layer (8) placed between the upper substrate polymer layer (5) and the lower substrate ITO transparent planar electrode (7), which are closely arranged. The blue phase liquid crystal of the blue phase liquid crystal layer (6) is polymer stabilized blue phase liquid crystal, and its thickness is 23 μm. The refractive index matching of the upper substrate glass layer (3), the lower substrate glass layer (8) and the upper substrate polymer layer (5) is all 1.52. The blue-phase liquid crystal lens (1) is composed of a series of blue-phase liquid crystal lens units. Each blue-phase liquid crystal lens unit and each upper substrate ITO transparent arc-shaped electrode unit have the same pitch, which is determined by the formula w = mQW _p /( Q + W _p ) calculates the pitch w = 101.92 μm, where m = 2, Q = 65 mm.

When there is no voltage between the upper substrate ITO transparent arc electrode (4) and the lower substrate ITO transparent flat electrode (7), there is no refractive index difference between the center and edge of the blue phase liquid crystal layer (6) in the blue phase liquid crystal lens unit, The 2D display screen (2) displays 2D images without parallax, and the device works in 2D mode at this time; when a voltage is applied between the upper substrate ITO transparent arc electrode (4) and the lower substrate ITO transparent flat electrode (7), Due to the uneven distribution of the electric field, there is a refractive index difference between the center and the edge of the blue phase liquid crystal layer (6) in the blue phase liquid crystal lens unit, and the light will form a lens-like phase distribution after passing through the blue phase liquid crystal layer (6), 2D display The screen (2) displays left and right parallax 2D images, and the viewer can see 3D images at the optimal viewing distance l= 800mm, and the device works in 3D mode at this time.

Set up a coordinate system as shown in Figure 1, where the origin of the coordinates is the center of the upper surface of the upper substrate glass layer (3), and the horizontal and vertical directions of the device are the x- axis and the z -axis, respectively.

Accompanying drawing 2 is the viewing area distribution diagram of the viewpoint in 3D mode of the 2D/3D switchable autostereoscopic display device based on the blue phase liquid crystal lens of this embodiment. The light emitted by the 2D display screen (2) (the red area in Figure 2) diverges along the positive direction of the z- axis after passing through the blue-phase liquid crystal lens (1), forming a series of viewing zones at the optimal viewing distance l = 800mm . Accompanying drawing 2 (a) is the viewing area distribution diagram of viewpoint 1 in 3D mode; accompanying drawing 2 (b) is the viewing area distribution diagram of viewpoint 2 in 3D mode. Figure 2 shows that the 2D/3D switchable autostereoscopic display device based on the blue-phase liquid crystal lens of this embodiment achieves good light splitting in 3D mode.

Accompanying drawing 3 is the luminance distribution diagram of viewpoint in 3D mode of the 2D/3D switchable autostereoscopic display device based on the blue phase liquid crystal lens of this embodiment. The solid line and curved line in Fig. 3 respectively represent the luminance distribution along the x- axis direction of viewpoint 1 and viewpoint 2 at the optimum viewing distance l =800mm. Figure 3 shows that the 2D/3D switchable autostereoscopic display device based on the blue-phase liquid crystal lens of this embodiment has a good brightness distribution of viewpoints in 3D mode and less crosstalk, thereby obtaining a good 3D display effect.

Claims (3)

1. A 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens, characterized in that the device comprises a blue-phase liquid crystal lens (1) and a 2D display screen (2), and the blue-phase liquid crystal lens (1) is placed Directly above the 2D display screen (2); the blue-phase liquid crystal lens (1) includes an upper substrate glass layer (3), an upper substrate ITO (indium tin oxide) transparent curved electrode (4), and an upper substrate polymer layer (5) , the lower substrate ITO transparent planar electrode (7), the blue phase liquid crystal layer (6) placed between the upper substrate polymer layer (5) and the lower substrate ITO transparent planar electrode (7), the lower substrate glass layer (8), They are closely arranged; the blue-phase liquid crystal lens (1) is composed of a series of blue-phase liquid crystal lens units, and each blue-phase liquid crystal lens unit and each upper substrate ITO transparent arc-shaped electrode unit have the same pitch w ; when the upper substrate When there is no voltage between the ITO transparent arc-shaped electrode (4) and the lower substrate ITO transparent flat electrode (7), there is no refractive index difference between the center and the edge of the blue-phase liquid crystal layer (6) in the blue-phase liquid crystal lens unit, and the 2D display screen (2) Display 2D images without parallax. At this time, the device works in 2D mode; when a voltage is applied between the upper substrate ITO transparent arc electrode (4) and the lower substrate ITO transparent flat electrode (7), due to the electric field Inhomogeneous distribution, the center and edge of the blue-phase liquid crystal layer (6) in the blue-phase liquid crystal lens unit have a refractive index difference, and the light will form a phase distribution similar to a lens after passing through the blue-phase liquid crystal layer (6), and the 2D display screen (2 ) to display left and right parallax 2D images, and the device works in 3D mode at this time. 2. A 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens according to claim 1, characterized in that the upper substrate glass layer (3), the lower substrate glass layer (8) and the upper substrate are aggregated The refractive index of the object layer (5) is matched. 3. A 2D/3D switchable autostereoscopic display device based on a blue-phase liquid crystal lens according to claim ₁ , wherein w is calculated by the formula w = mQWp /( Q + Wp ₎ , wherein, m is the number of viewpoints in 3D mode, Q is the interpupillary distance of human eyes, and W _p is the sub-pixel width of the 2D display.

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