CN110456554B - Display device - Google Patents
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- CN110456554B CN110456554B CN201910789567.4A CN201910789567A CN110456554B CN 110456554 B CN110456554 B CN 110456554B CN 201910789567 A CN201910789567 A CN 201910789567A CN 110456554 B CN110456554 B CN 110456554B
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
Abstract
The invention discloses a display device, comprising: the liquid crystal display device comprises a display panel, a liquid crystal lens and a polarization compensation element. The display panel provides a first incident light. The liquid crystal lens is configured on the display panel. The liquid crystal lens includes: the liquid crystal display device comprises a first substrate, a second substrate, a first liquid crystal layer, a first electrode layer and a second electrode layer which are oppositely arranged. The first liquid crystal layer is arranged between the first substrate and the second substrate. The first electrode layer is disposed between the first substrate and the first liquid crystal layer. The second electrode layer is configured between the second substrate and the first liquid crystal layer. The polarization compensation element is configured between the display panel and the liquid crystal lens. The polarization compensation element adjusts the polarization direction of the first incident light to be parallel to the long axis direction of the plurality of liquid crystal molecules in the first liquid crystal layer.
Description
Technical Field
The present invention relates to a display device, and more particularly, to a display device having a liquid crystal lens and a polarization compensation element.
Background
The main principle of the stereoscopic display technology is that the left eye and the right eye of a viewer respectively receive different images, and the images received by the left eye and the right eye are analyzed and overlapped by the brain so that the viewer can perceive the layering sense and the depth of a display picture, thereby generating stereoscopic sensation. Therefore, to display a stereoscopic image on a flat panel display, two sets of images interlaced with each other are provided on the same screen to simulate the vision of two eyes, and then two eyes receive the two sets of images respectively through a specific optical element to achieve the effect of a stereoscopic image.
A liquid crystal Lenticular stereoscopic display device has been proposed, which can be used to replace the conventional Barrier (parallel Barrier) or Lenticular Lens (Lenticular Lens) display to achieve the effect of planar (2D) -stereoscopic (3D) switchable. However, the liquid crystal lens requires a complicated electrode design and a voltage driving manner to make the liquid crystal lens approximate a solid lens. Therefore, the technical development of the liquid crystal lenticular stereoscopic display device still faces many challenges.
Disclosure of Invention
An embodiment of the invention provides a display device, which can adjust a polarization direction of a first incident light by a polarization compensation element to effectively reduce a light leakage phenomenon and improve a cross-talk noise (cross-talk) problem in a 3D mode.
An embodiment of the present invention provides a display device including: the liquid crystal display device comprises a display panel, a liquid crystal lens and a polarization compensation element. The display panel provides a first incident light. The liquid crystal lens is configured on the display panel. The liquid crystal lens includes: the liquid crystal display device comprises a first substrate, a second substrate, a first liquid crystal layer, a first electrode layer and a second electrode layer which are oppositely arranged. The first liquid crystal layer is arranged between the first substrate and the second substrate. The first electrode layer is disposed between the first substrate and the first liquid crystal layer. The second electrode layer is configured between the second substrate and the first liquid crystal layer. The polarization compensation element is configured between the display panel and the liquid crystal lens. The polarization compensation element adjusts the polarization direction of the first incident light to be substantially parallel to the long axis direction of the plurality of liquid crystal molecules in the first liquid crystal layer.
In an embodiment of the invention, the polarization compensation element includes a third substrate and a fourth substrate disposed opposite to each other, a second liquid crystal layer, a common electrode layer, a scan electrode layer, and an insulating layer. The second liquid crystal layer is configured between the third substrate and the fourth substrate. The common electrode layer is disposed between the fourth substrate and the second liquid crystal layer. The scanning electrode layer is configured between the common electrode layer and the second liquid crystal layer. The insulating layer is disposed between the common electrode layer and the scan electrode layer.
In an embodiment of the invention, the first electrode layer includes a plurality of first wide electrodes and a plurality of first narrow electrodes alternately arranged. The scan electrode layer includes a plurality of first scan electrodes and a plurality of second scan electrodes alternately arranged. The first wide electrodes are respectively overlapped on the first scanning electrodes, and the first narrow electrodes are respectively overlapped on the second scanning electrodes.
In an embodiment of the invention, a distance between two adjacent first wide electrodes is the same as a distance between two adjacent first scan electrodes.
In an embodiment of the invention, the second electrode layer includes a plurality of second wide electrodes and a plurality of second narrow electrodes alternately arranged. The first wide electrodes are respectively overlapped with the second narrow electrodes, and the first narrow electrodes are respectively overlapped with the second wide electrodes.
In an embodiment of the invention, a distance between two adjacent first wide electrodes is the same as a distance between two adjacent second wide electrodes.
In an embodiment of the invention, when the polarization compensation element is in an on-state, a horizontal electric field is generated between two adjacent first scan electrodes and second scan electrodes, such that the long axis direction of the liquid crystal molecules in the second liquid crystal layer is shifted along the horizontal electric field.
In an embodiment of the invention, in the first region, an included angle α is formed between a long axis direction of the liquid crystal molecules in the second liquid crystal layer and a polarization direction of the first incident light.
In an embodiment of the invention, after the first incident light passes through the polarization compensation element, a second incident light is formed to enter the liquid crystal lens, and the second incident light has another included angle β between the polarization direction of the first region and the long axis direction of the liquid crystal molecules in the second liquid crystal layer, and the included angle β is approximately equal to the included angle α.
In an embodiment of the invention, in the first region, an included angle γ is formed between the polarization direction of the second incident light and the polarization direction of the first incident light, and a value of the included angle γ is approximately equal to twice a value of the included angle α.
Based on the above, in an embodiment of the invention, the polarization direction of the first incident light is adjusted to be parallel to the long axis direction of the liquid crystal molecules in the first liquid crystal layer by the polarization compensation element, which can effectively reduce the light leakage phenomenon and improve the crosstalk noise problem in the 3D mode.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating a display device according to an embodiment of the invention.
Fig. 2A is a schematic diagram illustrating a relationship between a polarization direction of first incident light in the first region and a long axis direction of liquid crystal molecules in the second liquid crystal layer according to an embodiment of the invention.
Fig. 2B is a schematic diagram illustrating a relationship between a polarization direction of the first incident light in the second region and a long axis direction of the liquid crystal molecules in the second liquid crystal layer according to an embodiment of the invention.
Fig. 2C is a schematic diagram illustrating a relationship among a polarization direction of the first incident light, a long axis direction of the liquid crystal molecules in the second liquid crystal layer, a polarization direction of the second incident light, and a long axis direction of the liquid crystal molecules in the first liquid crystal layer in the first region and the corresponding third region according to an embodiment of the invention.
Fig. 2D is a schematic diagram illustrating a relationship among a polarization direction of the first incident light, a long axis direction of the liquid crystal molecules in the second liquid crystal layer, a polarization direction of the second incident light, and a long axis direction of the liquid crystal molecules in the first liquid crystal layer in the second region and the corresponding fourth region according to an embodiment of the invention.
Wherein, the reference numbers:
10: display device
100: display panel
150: first incident light
150P: polarization direction of first incident light
200: polarization compensation element
210: third substrate
218: third alignment layer
220: fourth substrate
221: common electrode layer
222: scanning electrode layer
223: insulating layer
224: first scanning electrode
226: second scanning electrode
228: a fourth alignment layer
230: a second liquid crystal layer
232: liquid crystal molecules
232LA1, 232LB1, 332LA2, 332LB 2: long axis direction of liquid crystal molecules
235: horizontal electric field
250: second incident light
250PA, 250 PB: polarization direction of the second incident light
300: liquid crystal lens
302: lens unit
310: first substrate
312: a first electrode layer
314: first wide electrode
316: first narrow electrode
318: a first alignment layer
320: second substrate
322: a second electrode layer
324: second wide electrode
326: second narrow electrode
328: second alignment layer
330: a first liquid crystal layer
330R: curve line
332: liquid crystal molecules
350: light emission
α, β, γ: included angle
A1: first region
B1: second region
A2: third zone
B2: fourth zone
P1, P2, P3: distance between each other
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings of the present embodiments. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The thickness of layers and regions in the drawings may be exaggerated for clarity. The same or similar reference numerals denote the same or similar elements, and the following paragraphs will not be repeated.
Fig. 1 is a schematic cross-sectional view illustrating a display device according to an embodiment of the invention. Fig. 2A is a schematic diagram illustrating a relationship between a polarization direction of first incident light in the first region and a long axis direction of liquid crystal molecules in the second liquid crystal layer according to an embodiment of the invention. Fig. 2B is a schematic diagram illustrating a relationship between a polarization direction of the first incident light in the second region and a long axis direction of the liquid crystal molecules in the second liquid crystal layer according to an embodiment of the invention.
Referring to fig. 1, an embodiment of a display device 10 includes: a display panel 100, a polarization compensation element 200, and a liquid crystal lens 300. The display panel 100 may provide the first incident light 150 having the polarization direction 150P. In some embodiments, the display panel 100 may be any component capable of displaying images, such as a liquid crystal display panel, an organic electroluminescent display panel, a plasma display panel, an electrophoretic display panel, a field emission display panel, etc., or other types of display panels. In addition, when the display panel 100 uses a non-self-luminous material (e.g., a liquid crystal material) as a display medium, it may optionally include a light source module located below the display panel 100 to provide a light source required by the display panel 100.
The liquid crystal lens 300 is disposed on the display panel 100. Specifically, the liquid crystal lens 300 includes: a first substrate 310, a second substrate 320, a first liquid crystal layer 330, a first electrode layer 312, a first alignment layer 318, a second electrode layer 322, and a second alignment layer 328. As shown in fig. 1, the first substrate 310 and the second substrate 320 are disposed opposite to each other. In some embodiments, the first substrate 310 and the second substrate 320 may be glass substrates or quartz substrates, for example. In other embodiments, the first substrate 310 and the second substrate 320 may also be transparent substrates made of other materials, such as polymer materials. The first liquid crystal layer 330 is disposed between the first substrate 310 and the second substrate 320. The first liquid crystal layer 330 includes a plurality of liquid crystal molecules 332, wherein the liquid crystal molecules 332 have optical anisotropy in an electric field and are optically isotropic in the absence of the electric field.
The first electrode layer 312 is disposed between the first substrate 310 and the first liquid crystal layer 330. In detail, the first electrode layer 312 includes a plurality of first wide electrodes 314 and a plurality of first narrow electrodes 316. As shown in fig. 1, the width of the first wide electrodes 314 is larger than that of the first narrow electrodes 316 as viewed from the Y direction, and the first wide electrodes 314 and the first narrow electrodes 316 are alternately arranged along the X direction. The two adjacent first wide electrodes 314 (or the two adjacent first narrow electrodes 316) have a pitch P1 therebetween, wherein the pitch P1 can be adjusted according to the actual design requirement. In some embodiments, the first wide electrode 314 and the first narrow electrode 316 may be stripe electrodes extending along the Y direction. The first alignment layer 318 is disposed between the first electrode layer 312 and the first liquid crystal layer 330. The first alignment layer 318 may align the liquid crystal molecules 332 in the first liquid crystal layer 330.
The second electrode layer 322 is disposed between the second substrate 320 and the first liquid crystal layer 330. In detail, the second electrode layer 322 includes a plurality of second wide electrodes 324 and a plurality of second narrow electrodes 326. As shown in fig. 1, the width of the second wide electrode 324 is greater than the width of the second narrow electrode 326 as viewed from the Y direction, in other words, the width of the second wide electrode 324 extending in the X direction is greater than the width of the second narrow electrode 326 extending in the X direction, and the second wide electrodes 324 and the second narrow electrodes 326 are alternately arranged along the X direction. The two adjacent second wide electrodes 324 (or the two adjacent second narrow electrodes 326) have a pitch P2 therebetween, wherein the pitch P2 can be adjusted according to the actual design requirement. In some embodiments, the second wide electrodes 324 and the second narrow electrodes 326 may be stripe electrodes extending along the Y direction. As shown in fig. 1, a third region a2 is defined between the adjacent second wide electrodes 324 and second narrow electrodes 326 to form a plurality of third regions a2 arranged along the X direction, each second wide electrode 324 and each second narrow electrode 326 define a fourth region B2 to form a plurality of fourth regions B2 arranged along the X direction, and the third regions a2 and the fourth regions B2 are alternately arranged along the X direction. Viewed along the Z direction, which is a normal direction perpendicular to the first substrate 310 or the second substrate 320, or toward the XY plane, the second wide electrodes 324 correspond to and overlap the first narrow electrodes 316, respectively, and the second narrow electrodes 326 correspond to and overlap the first wide electrodes 314, respectively. That is, the second wide electrodes 324 are disposed alternately with the first wide electrodes 314, and the second narrow electrodes 326 are disposed alternately with the first narrow electrodes 316. In another embodiment, pitch P2 is the same as pitch P1. In alternative embodiments, the material of the first electrode layer 312 and the second electrode layer 322 may be, for example, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Zinc Oxide (AZO), Gallium Zinc Oxide (GZO), Indium Gallium Oxide (IGO), Indium Gallium Zinc Oxide (IGZO), other suitable light-transmissive conductive materials or conductive materials with line widths that are not easily sensed by human eyes. In other embodiments, the first electrode layer 312 and the second electrode layer 322 may have the same conductive material or different conductive materials.
The second alignment layer 328 is disposed between the second electrode layer 322 and the first liquid crystal layer 330. In some embodiments, the alignment direction of the second alignment layer 328 is substantially parallel to the alignment direction of the first alignment layer 318. In some embodiments, the material of the first alignment layer 318 and the second alignment layer 328 may be, for example, Polyacetamide (PI), cellulose methyl ether (MC), polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyamide (polyamide), silicon oxide (SiO), silicon nitride (silicon nitride), silicon carbide (silicon carbide), insulating aluminum oxide (aluminum oxide), or the like. In other embodiments, the first alignment layer 318 and the second alignment layer 328 may have the same material or different materials.
In the present embodiment, when the first electrode layer 312 and the second electrode layer 322 are not driven (or are in an off state), the first liquid crystal layer 330 is in a homogeneous (homogenous) state as a whole. In this case, the image information provided by the display panel 100 passes through the liquid crystal lens 300, and then substantially provides the light 350 in the original transmission direction to display a two-dimensional image. That is, in the flat display mode, the liquid crystal lens 300 may not be driven.
In addition, when the first electrode layer 312 and the second electrode layer 322 are driven (or turned on), an electric field is applied to change the state of the first liquid crystal layer 330 to exhibit a specific refractive index distribution. At this time, the refractive index distribution of the first liquid crystal layer 330 may provide an effect similar to an optical lens. Therefore, the image information provided by the display panel 100 can be emitted in different directions (i.e. different viewing zones) by the liquid crystal lens 300, so as to provide the light 350 for displaying the stereoscopic image. Accordingly, the display device 10 may have at least two display modes, i.e., a stereoscopic (3D) display mode and a planar (2D) display mode.
As shown in fig. 1, the refractive index profile of the first liquid crystal layer 330 may, for example, exhibit a trend of a curve 330R, so as to define a plurality of lens units 302 in the first liquid crystal layer 330. In some embodiments, the refractive index profile in each lens cell 302 is graded (e.g., progressively larger or progressively smaller) outward from the central region.
Theoretically, the alignment direction (rubbing direction) or the long axis direction of the liquid crystal molecules 332 in the first liquid crystal layer 330 should be completely consistent with the polarization direction 150P of the first incident light 150, so as to realize an extra-ordinary light (e-light) 3D image. However, in practice, the liquid crystal molecules 332 are affected by the lateral electric field of the first electrode layer 312 or the second electrode layer 322, so that the liquid crystal molecules 332 deviate from the original alignment direction, and thus a certain amount of 2D image of ordinary light (o light) is formed. Since o-light has no lens effect in the liquid crystal lens 300, it causes light leakage, thereby increasing crosstalk noise in the 3D mode. In order to solve the above problem, in the display device 10 of the present embodiment, the polarization compensation element 200 is disposed between the display panel 100 and the liquid crystal lens 300 to adjust the polarization direction 150P of the first incident light 150, so as to effectively reduce the light leakage phenomenon and improve the crosstalk noise problem in the 3D mode.
Specifically, the polarization compensation element 200 includes: a third substrate 210, a fourth substrate 220, a second liquid crystal layer 230, a common electrode layer 221, a scan electrode layer 222, a third alignment layer 218, a fourth alignment layer 228, and an insulating layer 223.
As shown in fig. 1, the third substrate 210 and the fourth substrate 220 are disposed opposite to each other. In some embodiments, the third substrate 210 and the fourth substrate 220 may be, for example, glass substrates, quartz substrates, or polymer substrates. The second liquid crystal layer 230 is disposed between the third substrate 210 and the fourth substrate 220. The second liquid crystal layer 230 includes a plurality of liquid crystal molecules 232, wherein the liquid crystal molecules 232 have optical anisotropy in an electric field and are optically isotropic in the absence of the electric field. The third alignment layer 218 is disposed between the third substrate 210 and the second liquid crystal layer 230. The third alignment layer 218 may align the liquid crystal molecules 232 in the second liquid crystal layer 230.
The common electrode layer 221 is disposed between the fourth substrate 220 and the second liquid crystal layer 230. The common electrode layer 221 covers the lower surface of the fourth substrate 220. The scan electrode layer 222 is disposed between the common electrode layer 221 and the second liquid crystal layer 230. In some embodiments, the scan electrode layer 222 includes a plurality of first scan electrodes 224 and a plurality of second scan electrodes 226. As shown in fig. 1, the first scan electrodes 224 correspond to and overlap the first wide electrodes 314, respectively, and the second scan electrodes 226 correspond to and overlap the first narrow electrodes 316, respectively. The first scan electrodes 224 have the same width as the second scan electrodes 226 as viewed in the Y direction, in other words, the first scan electrodes 224 extend in the X direction by a width equal to that of the second scan electrodes 226 in the X direction and are alternately arranged along the X direction at the same pitch. Two adjacent first scan electrodes 224 (or two adjacent second scan electrodes 226) have a pitch P3 therebetween, wherein the pitch P3 is the same as the pitch P1. As shown in fig. 1, a first region a1 is defined between adjacent first scan electrodes 224 and second scan electrodes 226 to form a plurality of first regions a1 arranged along the X direction, each first scan electrode 224 and each second scan electrode 226 respectively define a second region B1 to form a plurality of second regions B1 arranged along the X direction, and the first regions a1 and the second regions B1 are alternately arranged along the X direction. In alternative embodiments, the material of the common electrode layer 221 and the scan electrode layer 222 may be, for example, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Aluminum Zinc Oxide (AZO), Gallium Zinc Oxide (GZO), Indium Gallium Oxide (IGO), Indium Gallium Zinc Oxide (IGZO), other suitable light-transmissive conductive materials or conductive materials with line widths that are not easily perceived by human eyes. In other embodiments, the common electrode layer 221 and the scan electrode layer 222 may have the same conductive material or different conductive materials.
The insulating layer 223 is disposed between the common electrode layer 221 and the scan electrode layer 222 to isolate the common electrode layer 221 from the scan electrode layer 222. In some embodiments, the material of the insulating layer 223 includes an inorganic dielectric material, which may be, for example, silicon oxide, silicon nitride, silicon oxynitride, other suitable dielectric materials, or combinations thereof.
The fourth alignment layer 228 is disposed between the scan electrode layer 222 and the second liquid crystal layer 230. In some embodiments, the alignment direction of the fourth alignment layer 228 is substantially parallel to the alignment direction of the third alignment layer 218. In some embodiments, the material of the third alignment layer 218 and the fourth alignment layer 228 may be, for example, Polyacetamide (PI), cellulose methyl ether (MC), polymethyl methacrylate (PMMA), polyvinyl alcohol (PVA), polyamide (polyamide), silicon oxide (SiO), silicon nitride (silicon nitride), silicon carbide (silicon carbide), insulating aluminum oxide (aluminum oxide), or the like. In other embodiments, the third alignment layer 218 and the fourth alignment layer 228 may have the same material or different materials.
In the present embodiment, when the polarization compensation element 200 is in the on-state, a horizontal electric field 235 is provided between two adjacent first scan electrodes 224 and second scan electrodes 226, that is, the horizontal electric field 235 is provided in the first area a1, such that the long axis direction 232LA1 of the liquid crystal molecules 232 in the second liquid crystal layer 230 is shifted along the horizontal electric field 235, in this case, as shown in fig. 1 and fig. 2A, in the first area a1, an included angle α is provided between the long axis direction 232LA1 of the liquid crystal molecules 232 in the second liquid crystal layer 230 and the polarization direction 150P of the first incident light 150, and the value of the included angle α is not equal to 180 degrees. In addition, as shown in fig. 1 and fig. 2B, in the second region B1, the long axis direction 232LB1 of the liquid crystal molecules 232 in the second liquid crystal layer 230 is substantially parallel to the polarization direction 150P of the first incident light 150, so the polarization direction of the light passing through the second liquid crystal layer 230 in the second region B1 is substantially unchanged.
It is noted that, after the first incident light 150 passes through the polarization compensation element 200, the second incident light 250 can be formed to enter the liquid crystal lens 300. In this case, as shown in fig. 1 and fig. 2C, in the first region a1 and the third region a2 overlapped with each other in the Z direction, an included angle β is formed between the polarization direction 250PA of the second incident light 250 and the long axis direction 232LA1 of the liquid crystal molecules 232 in the second liquid crystal layer 230, for example, the included angle β is about equal to the included angle α, which is 90 degrees for example, but not limited thereto. That is, the value of the angle γ between the polarization direction 250PA of the second incident light 250 and the polarization direction 150P of the first incident light 150 is approximately equal to twice the value of the angle α. In addition, as shown in fig. 1 and 2D, in the second region B1 and the fourth region B2 overlapped with each other in the Z direction, the long axis direction 232LB1 of the liquid crystal molecules 232 in the second liquid crystal layer 230, the long axis direction 332LB2 of the liquid crystal molecules 332 in the first liquid crystal layer 330, and the polarization direction 250PB of the second incident light 250 are substantially parallel to each other, so the polarization direction of the light passing through the regions is substantially unchanged.
In some embodiments, the horizontal electric field 235 can be controlled by the voltage applied to the scan electrode layer 222, so as to adjust the included angle α. Therefore, in the present embodiment, the polarization compensation element 200 can adjust the polarization direction 250PA or 250PB of the second incident light 250 entering the liquid crystal lens 300 to be completely consistent or approximately parallel to the alignment direction or the long axis direction 332LA2 or 332LB2 of the corresponding liquid crystal molecules 332 in the first liquid crystal layer 330, thereby effectively reducing the light leakage phenomenon caused by o light. In an alternative embodiment, the display device 10 of the present embodiment can have a better display brightness because the second incident light 250 passing through the polarization compensation element 200 only changes the polarization direction without being filtered out.
In summary, in an embodiment of the invention, the polarization direction of the first incident light is adjusted to be parallel to the long axis direction of the liquid crystal molecules in the first liquid crystal layer by the polarization compensation element, so that the light leakage phenomenon caused by o light can be effectively reduced, the crosstalk noise problem in the 3D mode can be improved, and the display quality of the 3D image can be improved. In addition, the second incident light passing through the polarization compensation element only changes the polarization direction and is not filtered out, so that the display device of the embodiment can have better display brightness.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A display device, comprising:
a display panel providing a first incident light;
a liquid crystal lens disposed on the display panel, wherein the liquid crystal lens comprises:
a first substrate and a second substrate disposed opposite to each other;
a first liquid crystal layer disposed between the first substrate and the second substrate;
a first electrode layer disposed between the first substrate and the first liquid crystal layer; and
a second electrode layer disposed between the second substrate and the first liquid crystal layer; and
a polarization compensation element disposed between the display panel and the LC lens, wherein the polarization compensation element adjusts a polarization direction of the first incident light to be substantially parallel to a long axis direction of the plurality of LC molecules in the first LC layer;
the polarization compensation element includes:
a third substrate and a fourth substrate disposed opposite to each other;
a second liquid crystal layer disposed between the third substrate and the fourth substrate;
a common electrode layer disposed between the fourth substrate and the second liquid crystal layer;
a scanning electrode layer disposed between the common electrode layer and the second liquid crystal layer; and
an insulating layer disposed between the common electrode layer and the scan electrode layer;
the first electrode layer comprises a plurality of first wide electrodes and a plurality of first narrow electrodes which are alternately arranged, the scanning electrode layer comprises a plurality of first scanning electrodes and a plurality of second scanning electrodes which are alternately arranged, the first wide electrodes are respectively overlapped with the first scanning electrodes, and the first narrow electrodes are respectively overlapped with the second scanning electrodes.
2. The display device according to claim 1, wherein a pitch of two adjacent first wide electrodes is the same as a pitch of two adjacent first scan electrodes.
3. The display device according to claim 1, wherein the second electrode layer comprises a plurality of second wide electrodes and a plurality of second narrow electrodes alternately arranged, the first wide electrodes are respectively overlapped with the second narrow electrodes, and the first narrow electrodes are respectively overlapped with the second wide electrodes.
4. The display device according to claim 3, wherein a pitch of two adjacent first wide electrodes is the same as a pitch of two adjacent second wide electrodes.
5. The display device according to claim 1, wherein when the polarization compensation element is in an on state, a horizontal electric field is provided between two adjacent first scan electrodes and second scan electrodes, such that a long axis direction of liquid crystal molecules in the second liquid crystal layer is shifted along the horizontal electric field.
6. The display device according to claim 5, wherein a first region is defined between the first scan electrode and the second scan electrode, and an included angle α is formed between the long axis direction of at least one of the liquid crystal molecules in the second liquid crystal layer and the polarization direction of the first incident light in the first region, and the included angle α is not equal to 180 degrees.
7. The display device according to claim 6, wherein the second electrode layer comprises a plurality of second wide electrodes and a plurality of second narrow electrodes alternately arranged, the first wide electrodes are respectively overlapped with the second narrow electrodes, the first narrow electrodes are respectively overlapped with the second wide electrodes, the first scan electrodes and the second scan electrodes define a plurality of second regions, respectively, a third region is defined between the second wide electrode and the second narrow electrode, the first incident light forms a second incident light after passing through the polarization compensation element to enter the liquid crystal lens in the first region and the third region overlapped with each other in a normal direction, the polarization direction of the second incident light and the long axis direction of at least one of the liquid crystal molecules in the second liquid crystal layer form an included angle beta, and the included angle beta is equal to the included angle alpha.
8. The display device according to claim 7, wherein the long axis direction of at least one of the liquid crystal molecules in the first liquid crystal layer and the polarization direction of the second incident light are substantially parallel in the first region and the third region overlapping each other in the normal direction.
9. The display device according to claim 8, wherein in the first region and the third region overlapping each other in the normal direction, a value of an angle γ between the polarization direction of the second incident light and the polarization direction of the first incident light is equal to a value of twice an angle α.
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| CN101968595B (en) * | 2010-10-13 | 2013-12-25 | 深圳市华星光电技术有限公司 | 2D/3D switching liquid crystal lens assembly and display device |
| JP5629717B2 (en) * | 2012-03-28 | 2014-11-26 | 株式会社東芝 | Liquid crystal lens device and image display device |
| TWI705268B (en) * | 2015-09-10 | 2020-09-21 | 美商聯思維公司 | Liquid crystal beam control device with improved zone transition and method of manufacture thereof |
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| CN103777414A (en) * | 2012-10-23 | 2014-05-07 | 株式会社东芝 | Liquid crystal optical element and image device |
| CN102944962A (en) * | 2012-11-15 | 2013-02-27 | 深圳市华星光电技术有限公司 | Liquid crystal lens module and stereoscopic display |
| CN103091929A (en) * | 2012-11-30 | 2013-05-08 | 友达光电股份有限公司 | Liquid crystal lens and stereoscopic display applying same |
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| CN110456554A (en) | 2019-11-15 |
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