WO2015131552A1

WO2015131552A1 - Substrate for liquid crystal lens and preparation method therefor, liquid crystal lens and stereoscopic display device

Info

Publication number: WO2015131552A1
Application number: PCT/CN2014/091388
Authority: WO
Inventors: 吴坤
Original assignee: 京东方科技集团股份有限公司
Priority date: 2014-03-06
Filing date: 2014-11-18
Publication date: 2015-09-11
Also published as: CN103869573A; CN103869573B

Abstract

A substrate (110) for a liquid crystal lens and a preparation method therefor, a liquid crystal lens (100) and a stereoscopic display device. The liquid crystal lens comprises strip electrodes (1121) of which the cross section is in the shape of a closed arc, wherein the light transmittance difference between the strip electrodes (1121) and surrounding spacing regions is slowly changed, the brightness of transmitted light rays will not be obviously changed, and a plurality of alternately dark and bright stripes which are spaced apart will not appear, thereby reducing the probability of generating Moire patterns.

Description

Substrate for liquid crystal lens and preparation method thereof, liquid crystal lens, stereoscopic display device

Technical field

The present invention belongs to the field of display technologies, and in particular, to a substrate for a liquid crystal lens, a method for fabricating the same, a liquid crystal lens, and a stereoscopic display device.

Background technique

With the rapid development of stereoscopic display technology, there is an increasing demand for stereoscopic display devices. Among the many technologies for realizing three-dimensional stereoscopic display, the naked-eye stereoscopic display is favored in the field of three-dimensional stereoscopic display because it does not require the viewer to wear special glasses.

As shown in FIG. 1 , the basic principle of a naked eye three-dimensional display is that the display panel 20 is divided into left and right (L, R) display areas, and the left and right (L, R) display areas respectively display images seen by the two eyes. The left and right display areas are each composed of a plurality of strips arranged alternately; and the display panel is provided with a lens 21, and the lens 21 can emit sub-pixels (a, b, c, d in FIG. 1) in different display areas. The light is concentrated and refracted into different spatial regions, so that the left and right eyes of the person respectively see the images of different display regions, and the effect of three-dimensional display is achieved. A liquid crystal lens including a liquid crystal layer may be used to reproduce a lens of a three-dimensional image, and it is driven by an electric field.

As shown in FIG. 2, a schematic structural diagram of a liquid crystal lens in the prior art, the liquid crystal lens 100 includes a first substrate 110, a second substrate 120, and a liquid crystal layer 130; wherein the liquid crystal layer 130 is disposed on the first substrate 110 and the second Between the substrates 120. The first substrate 110 includes a first substrate 111, and a first electrode layer 112 and a first alignment film 113 disposed on the first substrate 111, the second substrate 120 includes a second substrate 121, and is sequentially disposed in the second substrate The second electrode layer 122 and the second alignment film 123 on the substrate 121.

The first substrate 110 and the second substrate 120 are disposed at intervals. The first electrode layer 112 is disposed on the first substrate 111 of the first substrate 110, and is covered by the first alignment film 113. The second electrode layer 122 is disposed on the first substrate 110. The second substrate 121 of the second substrate 120 is covered by the second alignment film 123. The first electrode layer 112 and the second electrode layer 122 are used to generate an electric field that drives the liquid crystal molecules to rotate, thereby refracting the light to a desired position.

The first electrode layer 112 is a strip electrode 1121 including a plurality of spaced apart strips, and each of the strip electrodes 1121 has a rectangular cross section and has the same thickness.

In the above configuration of the liquid crystal lens 100, when light is incident on the liquid crystal lens 100 via the display panel 20, since the strip electrode 1121 of the liquid crystal lens 100 has a light transmittance different from the surrounding space, and the edge and the periphery of the strip electrode 1121 There is a significant shear variation in the transmittance of the spacer region, so that the brightness of the light is different, that is, it exhibits a significant change in luminance, and the whole exhibits a plurality of spaced light and dark stripes (corresponding to the liquid crystal lens 100 being a grating). These spacer stripes interfere with the black matrix of the display panel 20 (corresponding to another grating), thereby easily generating moiré, which affects the effect of the naked eye stereoscopic display.

As shown in FIG. 3 and FIG. 4, the cross-section of the strip electrode 1121 used in the prior art is generally trapezoidal or unequal stepped, although there is a certain relative to the electrode having a rectangular cross section in avoiding moiré of the stripe. Improved, but there are still defects that are prone to moiré. At the same time, the above-mentioned trapezoidal or stepped strip electrode 1121 usually requires multiple photolithography, which is disadvantageous to the popularization of the naked eye stereoscopic display technology due to complicated process, long process and high cost.

Summary of the invention

The object of the present invention is to solve the problem that the liquid crystal lens of the prior art has a problem that the moiré of the pixel black matrix of the display panel is superimposed due to the obvious shearing difference between the strip electrodes and the surrounding space. A substrate for a liquid crystal lens capable of reducing moiré generation, a method of manufacturing the same, a liquid crystal lens, and a stereoscopic display device.

A technical solution adopted to solve the technical problem of the present invention is a substrate for a liquid crystal lens, comprising: a first substrate; and a first electrode layer and a first alignment film provided on the first substrate, the first electrode layer a plurality of spaced apart strip electrodes, each of the strip electrodes having a closed arc perpendicular to a direction in which the strips extend; the closed arc comprising an arcuate portion away from the first substrate and adjacent to A straight line portion of the first substrate.

Preferably, the height of the closed arc is

Further preferably, the height of the closed arc is

Preferably, the closed arc has a width of 5-20 μm.

Preferably, the strip electrodes are prepared using a transparent conductive ink.

Preferably, the distance between adjacent strip electrodes is 10-20 μm.

Preferably, the transparent conductive ink is a water-soluble silver powder.

Preferably, the transparent conductive ink is poly 3,4-ethylenedioxythiophene/polystyrene sulfonate.

Another object of the present invention is to provide a method of fabricating the above substrate for a liquid crystal lens, comprising the steps of:

Printing a transparent conductive ink on the first substrate by screen printing, the screen screen having a strip mesh pattern;

After the transparent conductive ink is diffused, the transparent conductive ink is dried to obtain a strip electrode having a closed arc shape in cross section.

Preferably, the transparent conductive ink has a viscosity of 3-20p, the strip mesh has a width of 5-20 μm, the transparent conductive ink has a diffusion time of 1-15 min, and the transparent conductive ink has a drying temperature. 50-80 ° C, drying time is 2-8 min, the height of the strip electrode is

Another object of the present invention is to provide a liquid crystal lens comprising: a first substrate and a second substrate disposed at intervals, and a liquid crystal layer between the first substrate and the second substrate;

Wherein the first substrate of the first substrate;

The second substrate includes a second substrate and a second electrode layer disposed on the second substrate and a second alignment film formed on the second electrode layer, wherein the first electrode layer and the first The two electrode layers are used to generate an electric field.

Another object of the present invention is to provide a stereoscopic display device comprising a display panel and a liquid crystal lens disposed outside the light-emitting surface of the display panel, wherein the liquid crystal lens uses the liquid crystal lens described above.

The liquid crystal lens substrate of the present invention, the liquid crystal lens thereof and the stereoscopic display device have the following advantages: the difference between the light transmittance of the strip-shaped electrode having a closed arc shape and the surrounding space is slowly changed, and the brightness of the transmitted light is not Will change significantly, no There will be a plurality of spaced dark and dark stripes, which reduces the probability of moiré. At the same time, using the fluidity of the transparent conductive ink, the transparent conductive ink is diffused to both sides and solidified to form a strip electrode having a closed arc shape. The method is simple to make, the process is simplified, and the production cost is reduced.

DRAWINGS

FIG. 1 is a schematic diagram of a three-dimensional stereoscopic display of a naked eye in the prior art.

2 is a schematic view showing the structure of a liquid crystal lens in the prior art.

3 is a schematic view showing the structure of a trapezoidal cross-section electrode in the prior art.

4 is a schematic view showing the structure of a non-equal stepped cross-sectional noodle-shaped electrode in the prior art.

FIG. 5 is a schematic structural view of a liquid crystal lens substrate and a liquid crystal lens according to Embodiment 1 of the present invention.

6 is a flow chart showing a method of fabricating a liquid crystal lens substrate according to Embodiment 2 of the present invention.

among them:

100. liquid crystal lens; 110. first substrate; 111. first substrate; 112. first electrode layer; 1121. strip electrode; 113. first alignment film; 120. second substrate; 121. 122. second electrode layer; 123. second alignment film; 130. liquid crystal layer; 20. display panel;

detailed description

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

Example 1

As shown in FIG. 5, the present embodiment provides a substrate 110 for a liquid crystal lens, which includes a first substrate 111 and a first electrode layer 112 disposed on the first substrate 111. The first electrode layer 112 includes a plurality of Strip electrodes 1121 are disposed at intervals, and a cross section perpendicular to the extending direction of each strip electrode 1121 is a closed arc shape; the closed arc includes an arc portion away from the first substrate 111 and close to the first substrate The straight part of 111.

The present embodiment further provides a liquid crystal lens 100 including a first substrate 110, a second substrate 120, and a liquid crystal layer 130. The first substrate 110 includes a first electrode layer 112 and a first alignment film 113, and the second substrate 120 The second electrode layer 122 and the second alignment film 123 are disposed, wherein the first substrate 110 and the second substrate 120 are relatively spaced apart, the liquid crystal layer 130 is located between the first substrate 110 and the second substrate 120, and the first electrode layer 112 is disposed. On the first substrate 111 of the first substrate 110, covered by the first alignment film 113, the second electrode layer 122 is disposed on the second substrate 121 of the second substrate 120, and is covered by the second alignment film 123.

The substrate 110 for the liquid crystal lens and the strip electrode 1121 of the liquid crystal lens 100 in this embodiment have a closed arc shape, and the light transmittance is slowly changed due to the difference in transmittance between the strip electrode 1121 and the surrounding space. The brightness does not change significantly, and there are no multiple intervals of light and dark stripes, which reduces the chance of moiré.

The strip electrode 1121 having a closed arc shape is gradually thinned from the center to the both sides. Preferably, the height of the closed arc (ie the distance between the top of the arc and the portion of the straight line) is

More preferably, the height of the closed arc is

The strip electrode 1121 of the above thickness range can ensure a large transmittance and is easy to manufacture.

Preferably, the width of the closed arc (the length of the straight portion) is 5-20 μm, and the distance between the adjacent strip electrodes 1121 is 10-20 μm; the above width range can better meet the design requirements of the 3D display for the liquid crystal lens.

The preferred strip electrode 1121 is prepared by using a transparent conductive ink, which can have a certain fluidity on the basis of good electrical conductivity, and facilitates the fabrication of the strip electrode 1121 having a closed arc shape. It should be understood that existing transparent conductive inks are suitable.

Specifically, the transparent conductive ink is water-soluble silver powder or poly 3,4-ethylenedioxythiophene/polystyrene sulfonate.

Example 2

As shown in FIG. 6, the embodiment provides a method for preparing the above substrate, which includes the following steps:

1) printing a transparent conductive ink on a first substrate by screen printing, the screen screen having a strip mesh pattern;

2) After the transparent conductive ink is diffused, the transparent conductive ink is dried to obtain a strip electrode having a closed arc shape in cross section.

Specifically, it can be completed by a production step having the following process parameters:

1) Adjusting the viscosity of the water-soluble silver powder to have a viscosity of 3-20 p, which is 6p in this embodiment; producing a screen screen having a strip-shaped mesh pattern, wherein the width of the strip-shaped mesh is 5-20 μm, the mesh The width of the strip portion is slightly smaller than the length of the straight portion of the closed arc (due to the diffusion of the water-soluble silver powder), and the width of the strip-shaped mesh in the present embodiment is 10 μm.

2) The water-soluble silver powder is screen-printed on the first substrate 111 by a screen, and the strip electrode 1121 has a rectangular cross-sectional shape when the printing is completed as shown in FIG.

3) Dispersing the water-soluble silver powder, the diffusion time is generally 1-15 min, in this embodiment 2 min, the cross-sectional shape of the strip electrode 1121 in the diffusion is as shown in FIG. 6, and the cross-sectional shape of the strip electrode 1121 after the diffusion is completed Closed arc. Then, the strip electrode 1121 is dried, and can be dried at 50-80 ° C. The present embodiment is dried at 60 ° C, and the drying time can be 2-8 min. In this embodiment, it is 3 min, by controlling the viscosity of the water-soluble silver powder, The diffusion time and the drying rate are such that the height of the strip electrode 1121 is

The height of the strip electrode 1121 of this embodiment is

The preparation of other functional layers of the liquid crystal lens 100 can be prepared by a known method and will not be described again.

In this embodiment, a strip electrode 1121 having a closed arc shape is prepared by screen screen printing, and the transparent conductive ink is diffused to both sides by the fluidity of the transparent conductive ink (water-soluble silver powder), so that the transparent conductive ink is directed to both sides. Diffusion and solidification form a strip electrode 1121 having a cross-sectional shape of a closed arc, which is simple in fabrication, simplified in flow, and low in production cost.

It should be understood that the transparent conductive ink may also be poly 3,4-ethylenedioxythiophene/polystyrene sulfonate, and the above preparation parameters can be adjusted to prepare the height.

Strip electrode 1121.

Example 3

The embodiment provides a stereoscopic display device, including a display panel and a liquid crystal lens disposed outside the light-emitting surface of the display panel, wherein the liquid crystal lens adopts the liquid crystal lens described above.

It is to be understood that the above embodiments are merely exemplary embodiments employed to explain the principles of the invention, but the invention is not limited thereto. The stereoscopic display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like. For the implementation of the stereoscopic display device, reference may be made to the above embodiments, and the repeated description is omitted. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the invention. These modifications and improvements are also considered to be within the scope of the invention.

Claims

A substrate for a liquid crystal lens, comprising: a first substrate; and a first electrode layer and a first alignment film disposed on the first substrate, wherein the first electrode layer comprises a plurality of spaced strip electrodes The cross section of each of the strip electrodes perpendicular to the extending direction thereof is a closed arc shape; the closed arc shape includes an arc portion away from the first substrate and a line close to the first substrate section.
The substrate according to claim 1, wherein the height of the closed arc is
The substrate according to claim 2, wherein the height of the closed arc is
The substrate according to claim 1, wherein the closed arc has a width of 5 to 20 μm.
The substrate according to claim 1, wherein a distance between adjacent strip electrodes is 10-20 μm.
The substrate according to claim 1, wherein said strip electrodes are prepared using a transparent conductive ink.
The substrate according to claim 6, wherein the transparent conductive ink is a water-soluble silver powder.
The substrate according to claim 6, wherein the transparent conductive ink is poly 3,4-ethylenedioxythiophene/polystyrene sulfonate.
A method of preparing a substrate according to any one of claims 1-8, characterized in that Therefore, the following steps are included:

Printing a transparent conductive ink on the first substrate by screen printing, the screen screen having a strip mesh pattern;

After the transparent conductive ink is diffused, the transparent conductive ink is dried to obtain a strip electrode having a closed arc shape in cross section.
The method for preparing a substrate according to claim 9, wherein the transparent conductive ink has a viscosity of 3-20p, the strip mesh has a width of 5-20 μm, and the transparent conductive ink has a diffusion time. The drying temperature of the transparent conductive ink is 50-80 ° C, the drying time is 2-8 min, and the height of the strip electrode is 1-15 min.
A liquid crystal lens comprising: a first substrate and a second substrate disposed at intervals, and a liquid crystal layer between the first substrate and the second substrate,

The first substrate is the first substrate according to any one of claims 1 to 8;

The second substrate includes a second substrate and a second electrode layer disposed on the second substrate and a second alignment film formed on the second electrode layer, wherein

The first electrode layer and the second electrode layer are used to generate an electric field.
A stereoscopic display device comprising a display panel and a liquid crystal lens disposed outside the light-emitting surface of the display panel, wherein the liquid crystal lens adopts the liquid crystal lens according to claim 11.