CN106200067B - Optical waveguide display device and its manufacturing method - Google Patents
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- 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
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Abstract
本发明公开了一种光波导显示装置及其制造方法，属于显示技术领域。光波导显示装置包括：对盒成形的两个显示基板、位于两个显示基板之间的液晶以及设置在两个显示基板侧面的光源，液晶在未加电压时具有第一折射率，在加电压时具有第二折射率，第一折射率、显示基板的折射率和第二折射率依次增大。本发明解决了控制子区域发光的方式较单一的问题，丰富了控制子区域发光的方式，用于光波导显示装置。
The invention discloses an optical waveguide display device and a manufacturing method thereof, belonging to the technical field of display. The optical waveguide display device includes: two display substrates formed in a cell, a liquid crystal located between the two display substrates, and a light source arranged on the side of the two display substrates. The liquid crystal has a first refractive index when no voltage is applied, and when the voltage is applied When it has a second refractive index, the first refractive index, the refractive index of the display substrate and the second refractive index increase sequentially. The invention solves the problem that the way of controlling the light emission of the sub-region is relatively simple, enriches the way of controlling the light-emitting of the sub-region, and is used in an optical waveguide display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to an optical waveguide display device and a manufacturing method thereof.
Background
The optical waveguide display device may include an array substrate and a cover plate formed into a box, a filler between the array substrate and the cover plate, and a light source disposed at sides of the array substrate and the cover plate. The filler may be composed of a liquid crystal and a high molecular polymer, and the refractive index of the liquid crystal when no voltage is applied is different from the refractive index when a voltage is applied, and is the same as the refractive index of the high molecular polymer (larger than the refractive index of glass).
The display area of the optical waveguide display device may be composed of a plurality of sub-areas, which display area is capable of displaying an image when a part of the sub-areas emit light and another part of the sub-areas do not emit light. In the related art, the light source emits light toward the cover plate at an angle greater than the critical angle between the filler and the cover plate (usually made of glass). When a certain subregion is controlled not to emit light, voltage can not be applied to liquid crystals of the subregion, at the moment, incident light rays can pass through the liquid crystals and the high molecular polymers before being emitted to the cover plate, the refractive indexes of the liquid crystals and the high molecular polymers of the subregion are the same and are both larger than that of glass, so that the propagation direction of the incident light rays passing through the liquid crystals and the high molecular polymers cannot be changed, when the incident light rays reach the cover plate, the incident light rays meet the condition of total reflection, and therefore the total reflection can be carried out on the cover plate, and the subregion does not emit light. When a certain subregion is controlled to emit light, voltage can be applied to the liquid crystal in the subregion, after the voltage is applied to the liquid crystal in the subregion, the refractive index of the liquid crystal in the subregion is changed, when incident light passes through the liquid crystal and reaches a high polymer, the refractive indexes of the liquid crystal and the high polymer are different, so the liquid crystal can be refracted on the high polymer and finally refracted to the cover plate, the incident angle of part of the incident light reaching the cover plate is not larger than the critical angle corresponding to the filler and the cover plate, namely, the incident light reaching the cover plate does not meet the condition of total reflection, the total reflection cannot be generated on the cover plate and the incident light can be emitted from the cover plate, and the subregion emits light.
In the related art, when the optical waveguide display device controls the sub-regions to emit light, the incident angle of the incident light reaching the cover plate is changed to destroy the condition that the light is totally reflected on the cover plate, so that the sub-regions emit light, and therefore, the light emitting mode of the sub-regions is controlled to be single.
Disclosure of Invention
The invention provides an optical waveguide display device and a manufacturing method thereof, aiming at solving the problem that the way of controlling the sub-area to emit light is single. The technical scheme is as follows:
in one aspect, there is provided an optical waveguide display device including: two display substrates formed into a cell, liquid crystal between the two display substrates, and a light source disposed at a side of the two display substrates,
the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied, and the first refractive index, the refractive index of the display substrate and the second refractive index are increased in sequence.
Optionally, an incident angle of the light emitted by the light source on the display substrate is greater than a preset critical angle, where the preset critical angle is a critical angle corresponding to the liquid crystal and the display substrate when no voltage is applied.
Optionally, an included angle between the orientation direction of the liquid crystal when no voltage is applied and the incident direction of the light is a first included angle, an included angle between the orientation direction of the liquid crystal when a voltage is applied and the incident direction of the light is a second included angle,
the absolute value of the first included angle is smaller than a first preset threshold, the absolute value of the difference between the second included angle and 90 degrees is smaller than a second preset threshold, and the absolute value of the first included angle is smaller than the absolute value of the second included angle.
Optionally, the orientation direction of the liquid crystal when no voltage is applied is parallel to the incident direction of the light;
the orientation direction of the liquid crystal when voltage is applied is vertical to the incident direction of the light.
Optionally, the preset critical angle is θc，
Wherein,is composed ofArcsine value of, ngIs the first refractive index, naIs the refractive index of the display substrate.
In another aspect, there is provided a method of manufacturing an optical waveguide display device, the method including:
forming the two display substrates in a box-to-box mode;
filling liquid crystal between two display substrates formed by a pair of boxes, wherein the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied, and the first refractive index, the refractive index of the display substrates and the second refractive index are increased in sequence;
light sources are provided on the sides of the two display substrates formed into a cell.
Optionally, an incident angle of the light emitted by the light source on the display substrate is greater than a preset critical angle, where the preset critical angle is a critical angle corresponding to the liquid crystal and the display substrate when no voltage is applied.
Optionally, an included angle between the orientation direction of the liquid crystal when no voltage is applied and the incident direction of the light is a first included angle, an included angle between the orientation direction of the liquid crystal when a voltage is applied and the incident direction of the light is a second included angle,
the absolute value of the first included angle is smaller than a first preset threshold, the absolute value of the difference between the second included angle and 90 degrees is smaller than a second preset threshold, and the absolute value of the first included angle is smaller than the absolute value of the second included angle.
Optionally, the orientation direction of the liquid crystal when no voltage is applied is parallel to the incident direction of the light;
the orientation direction of the liquid crystal when voltage is applied is vertical to the incident direction of the light.
Optionally, the preset critical angle is θc，
Wherein,is composed ofArcsine value of, ngIs the first refractive index, naIs the refractive index of the display substrate.
In summary, embodiments of the present invention provide an optical waveguide display device and a method for manufacturing the same, in which only liquid crystal is disposed between two display substrates, and the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied. When the light emission of the sub-region in the optical waveguide display device needs to be controlled, the voltage can be prohibited from being applied to the liquid crystal, the refractive index of the liquid crystal is smaller than that of the display substrate, the light emitted by the light source does not meet the condition of total reflection on the surface of the display substrate, and therefore the light can penetrate through the display substrate and is emitted out, so that the sub-region emits light. That is, the invention controls the refractive index of the liquid crystal to be smaller than that of the display substrate, so that the light ray can be emitted from the sub-region on the display substrate without meeting the total reflection condition, and the way of controlling the light emission of the sub-region is enriched.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1-1 is a schematic view of an application scenario of a backlight module provided in the related art;
fig. 1-2 are schematic structural diagrams of an optical waveguide display device provided in the related art;
FIG. 2-1 is a schematic structural diagram of an optical waveguide display device according to an embodiment of the present invention;
FIG. 2-2 is a schematic diagram of a liquid crystal state when no voltage is applied according to an embodiment of the present invention;
FIGS. 2-3 are schematic diagrams of a liquid crystal state when a voltage is applied according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for manufacturing an optical waveguide display device according to an embodiment of the present invention.
With the foregoing drawings in mind, there have been shown specific embodiments of the invention and will be described in more detail hereinafter. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but instead to describe it for those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-1, in the related art, a side-in type backlight module 0 is generally used to provide incident light for a display panel a. The edge-type backlight module 0 may include a light source 01 and a light guide plate 02, wherein the light guide plate 02 is disposed on the light incident side of the display panel a, the light source 01 is disposed on the side surface of the light guide plate 02, and light emitted from the light source 01 can enter the light guide plate from the side surface of the light guide plate 02, and exit from the light exit side of the light guide plate 02, and then enter the display panel a.
For example, when a light ray is incident from a first medium to a second medium, if the refractive index of the first medium is greater than that of the second medium, and the incident angle of the light ray on the second medium is greater than the critical angle corresponding to the first medium and the second medium, the light ray can be totally reflected on the surface of the second medium, and in particular, the critical angle corresponding to the first medium and the second medium may be an inverse number of a sine function of a ratio of the refractive index of the first medium to the refractive index of the second medium.
As shown in fig. 1 to 2, in the related art, there is an optical waveguide display device 1, and the optical waveguide display device 1 may include an array substrate 11 and a cover plate 12 formed into a box, a filler 13 between the array substrate 11 and the cover plate 12, and a light source 14 disposed at a side of the array substrate 11 and the cover plate 12. The filler 13 may be composed of a liquid crystal 131 and a polymer 132, and the refractive index of the liquid crystal 131 when no voltage is applied is different from the refractive index when a voltage is applied, and is the same as the refractive index of the polymer 132 (larger than the refractive index of glass). The display area of the optical waveguide display device 1 may be composed of a plurality of sub-areas, which display area is capable of displaying an image when a part of the sub-areas emit light and another part of the sub-areas do not emit light. In the related art, the light source 14 emits light toward the cover plate 12 (or the array substrate 11) at an angle greater than a critical angle corresponding to the filler 13 and the cover plate 12 (usually made of glass) when no voltage is applied. Illustratively, the critical angle may be θc，Wherein,is composed ofArcsine value of, n1Is the refractive index, n, of the filler 13 (or the array substrate 11) when no voltage is applied2Is the index of refraction of the cover plate 12.
When a certain sub-region B1 is controlled not to emit light, no voltage may be applied to the liquid crystal 131 of the sub-region B1, at this time, the incident light passes through the liquid crystal 131 and the high molecular polymer 132 before reaching the cover plate 12, since the refractive indexes of the liquid crystal 131 and the high molecular polymer 132 of the sub-region B1 are the same and are both greater than the refractive index of glass, the propagation direction of the incident light after passing through the liquid crystal 131 and the high molecular polymer 132 is not changed, and when the incident light reaches the cover plate 12, the incident light satisfies the condition of total reflection, so that total reflection can occur on the cover plate 12, and the sub-region B1 does not emit light. When a certain sub-region B2 is controlled to emit light, a voltage may be applied to the liquid crystal 131 of the sub-region B2, after the voltage is applied to the liquid crystal 131 of the sub-region B2, the refractive index of the liquid crystal 131 of the sub-region B2 is changed, when an incident light passes through the liquid crystal 131 and reaches the high molecular polymer 132, the refractive indexes of the liquid crystal 131 and the high molecular polymer 132 are different, so the liquid crystal 131 is refracted on the high molecular polymer 1 and finally refracted to the cover plate 12, and the incident angle of a part of the incident light reaching the cover plate 12 is not greater than the critical angle corresponding to the filler and the cover plate, that is, the incident light reaching the cover plate does not satisfy the condition of total reflection, so that the incident light cannot be totally reflected on the cover plate 12 and can be emitted from the cover plate 12, so.
Since the sub-region B2 emits light by changing the incident angle of the incident light beam on the cover 12 and destroying the total reflection of the light beam on the cover 12 when the sub-region B2 is controlled to emit light in the related art, the sub-region B2 is controlled to emit light in a single manner.
As shown in fig. 2-1, an embodiment of the present invention provides an optical waveguide display device 2, where the optical waveguide display device 2 may include: two display substrates 21 formed in a cell, a liquid crystal 22 between the two display substrates 21, and a light source 23 disposed at a side of the two display substrates 21,
the liquid crystal 22 has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied, and the first refractive index, the refractive index of the display substrate 21, and the second refractive index increase in this order.
In summary, the embodiments of the present invention provide an optical waveguide display device, in which only liquid crystal is disposed between two display substrates, and the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied. When the light emission of the sub-region in the optical waveguide display device needs to be controlled, the voltage can be prohibited from being applied to the liquid crystal, the refractive index of the liquid crystal is smaller than that of the display substrate, the light emitted by the light source does not meet the condition of total reflection on the surface of the display substrate, and therefore the light can penetrate through the display substrate and is emitted out, so that the sub-region emits light. That is, the invention controls the refractive index of the liquid crystal to be smaller than that of the display substrate, so that the light ray can be emitted from the sub-region on the display substrate without meeting the total reflection condition, and the way of controlling the light emission of the sub-region is enriched.
Optionally, the incident angle M of the light emitted from the light source 23 on the display substrate 21 is greater than a predetermined critical angle, and the predetermined critical angle may be a critical angle corresponding to the liquid crystal 22 and the display substrate 21 when no voltage is applied. Specifically, the predetermined critical angle may be θc，Wherein,is composed ofArcsine value of, ngIs a first refractive index, naThe refractive index of the display substrate. Because the incident angle of the light emitted by the light source 23 on the display substrate 21 is greater than the preset critical angle, when it is required to control a certain sub-region in the optical waveguide display device not to emit light, a voltage may be applied to the liquid crystal 22, at this time, the refractive index of the liquid crystal 22 is greater than the refractive index of the display substrate 21, and the incident angle of the light emitted by the light source 23 on the display substrate 21 is greater than the preset critical angle, that is, the light emitted by the light source 23 satisfies the total reflection condition and can be totally reflected on the display substrate 21, at this time, no light is emitted from the sub-region on the display substrate 21, so that the sub-region in the.
Fig. 2-2 are schematic diagrams of a liquid crystal state when no voltage is applied according to an embodiment of the present invention, and fig. 2-3 are schematic diagrams of a liquid crystal state when a voltage is applied according to an embodiment of the present invention. Referring to fig. 2-2 and 2-3, an angle between the orientation direction of the liquid crystal 22 when no voltage is applied and the incident direction of the light is a first angle a, and an angle between the orientation direction of the liquid crystal 11 when a voltage is applied and the incident direction of the light is a second angle B, where an absolute value of the first angle a is smaller than a first preset threshold, that is, an absolute value of the first angle a and 0 degrees is smaller than the first preset threshold, an absolute value of a difference between the second angle B and 90 degrees is smaller than a second preset threshold, and the absolute value of the first angle a is smaller than the absolute value of the second angle B.
Note that, when the alignment direction of the liquid crystal 22 is parallel to the incident direction of the light, the refractive index of the liquid crystal 22 to the light becomes minimum, and when the alignment direction of the liquid crystal 22 is perpendicular to the incident direction of the light, the refractive index of the liquid crystal 22 to the light becomes maximum. That is, when the absolute value of the angle between the alignment direction of the liquid crystal 22 and the incident direction of the light is greater than or equal to 0 degrees and less than or equal to 90 degrees, the magnitude of the absolute value of the angle between the alignment direction of the liquid crystal 22 and the incident direction of the light is proportional to the refractive index of the liquid crystal, and the refractive index of the liquid crystal is smaller as the absolute value of the angle between the alignment direction of the liquid crystal 22 and the incident direction of the light is larger and the refractive index of the liquid crystal is larger as the absolute value of the angle between the alignment direction of the liquid crystal 22 and the incident direction of the light is smaller.
In the embodiment of the present invention, the orientation direction of the liquid crystal 22 when no voltage is applied can be controlled to be parallel to the incident direction of the light as much as possible, that is, the absolute value of the first included angle a is controlled to be smaller than the first preset threshold, so that the liquid crystal has a smaller refractive index when no voltage is applied; the orientation direction of the liquid crystal 22 is controlled to be perpendicular to the incident direction of the light as much as possible when the voltage is applied, that is, the difference between the absolute value of the second included angle B and 90 degrees is controlled to be smaller than the second preset threshold, so that the liquid crystal 22 has a larger refractive index when the voltage is not applied, that is, the refractive index of the liquid crystal is larger than that when the voltage is not applied when the voltage is applied.
Preferably, the alignment direction of the liquid crystal 22 when no voltage is applied is parallel to the incident direction of the light, and the alignment direction of the liquid crystal 22 when a voltage is applied is perpendicular to the incident direction of the light. When the orientation direction of the liquid crystal is parallel to the incident direction of the light, the refractive index of the liquid crystal to the light reaches a minimum value, and when the orientation direction of the liquid crystal is perpendicular to the incident direction of the light, the refractive index of the liquid crystal to the light reaches a maximum value. At this time, the difference between the first refractive index and the second refractive index is large, and the refractive index of the display substrate can be ensured to be just between the first refractive index and the second refractive index.
Referring to fig. 2-2, when it is required to control a sub-region of the optical waveguide display device to emit light, a voltage is prohibited from being applied to the liquid crystal 22, at this time, the refractive index of the liquid crystal 22 is smaller than the refractive index of the display substrate 21, the incident angle M of the light emitted from the light source 23 on the display substrate 21 is larger than a predetermined critical angle, and the light emitted from the light source does not satisfy the condition of total reflection on the surface of the display substrate 21, so that the light passes through the display substrate 21 and is emitted out, so that the sub-region emits light. Referring to fig. 2-3, when it is required to control a sub-region in the optical waveguide display device not to emit light, a voltage may be applied to the liquid crystal 22, where the refractive index of the liquid crystal 22 is greater than the refractive index of the display substrate 21, the incident angle M of the light emitted from the light source 23 on the display substrate 21 is greater than a predetermined critical angle, and the light emitted from the light source satisfies a total reflection condition on the surface of the display substrate 21, so that the light is totally reflected on the surface of the display substrate 21, and no light passes through the display substrate 21, so that the sub-region does not emit light.
In summary, the embodiments of the present invention provide an optical waveguide display device, in which only liquid crystal is disposed between two display substrates, and the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied. When the light emission of the sub-region in the optical waveguide display device needs to be controlled, the voltage can be prohibited from being applied to the liquid crystal, the refractive index of the liquid crystal is smaller than that of the display substrate, the light emitted by the light source does not meet the condition of total reflection on the surface of the display substrate, and therefore the light can penetrate through the display substrate and is emitted out, so that the sub-region emits light. That is, the invention controls the refractive index of the liquid crystal to be smaller than that of the display substrate, so that the light ray can be emitted from the sub-region on the display substrate without meeting the total reflection condition, and the way of controlling the light emission of the sub-region is enriched.
As shown in fig. 3, an embodiment of the present invention provides a method for manufacturing an optical waveguide display device, which may include:
step 301, two display substrates are formed into a cell.
Step 302, filling liquid crystal between two display substrates formed by the box, wherein the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when the voltage is applied, and the first refractive index, the refractive index of the display substrates and the second refractive index are increased in sequence.
Step 303, arranging light sources on the sides of the two display substrates formed into the box.
In summary, the embodiments of the present invention provide a method for manufacturing an optical waveguide display device, in which only liquid crystal is filled between two display substrates, and the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied. When the light emission of the sub-region in the optical waveguide display device needs to be controlled, the voltage can be prohibited from being applied to the liquid crystal, the refractive index of the liquid crystal is smaller than that of the display substrate, the light emitted by the light source does not meet the condition of total reflection on the surface of the display substrate, and therefore the light can penetrate through the display substrate and is emitted out, so that the sub-region emits light. That is, the invention controls the refractive index of the liquid crystal to be smaller than that of the display substrate, so that the light ray can be emitted from the sub-region on the display substrate without meeting the total reflection condition, and the way of controlling the light emission of the sub-region is enriched.
Optionally, an incident angle of the light emitted by the light source on the display substrate is greater than a preset critical angle, and the preset critical angle may be a critical angle corresponding to the liquid crystal and the display substrate when no voltage is applied. Specifically, the predetermined critical angle may be θc，Wherein,is composed ofArcsine value of, ngIs a first refractive index, naThe refractive index of the display substrate. Because the incident angle of the light emitted by the light source on the display substrate is greater than the preset critical angle, when a certain sub-region in the optical waveguide display device needs to be controlled not to emit light, a voltage can be applied to the liquid crystal, the refractive index of the liquid crystal is greater than that of the display substrate at the moment, and the incident angle of the light emitted by the light source on the display substrate is greater than the preset critical angle, namely, the light emitted by the light source meets the total reflection condition and can be totally reflected on the display substrate, and no light is emitted from the sub-region on the display substrate at the moment, so that the sub-region in the optical waveguide display device does not emit.
The included angle between the orientation direction of the liquid crystal when no voltage is applied and the incident direction of the light is a first included angle, the included angle between the orientation direction of the liquid crystal when the voltage is applied and the incident direction of the light is a second included angle, wherein the absolute value of the first included angle is smaller than a first preset threshold value, namely the absolute value of the first included angle and 0 degree is smaller than the first preset threshold value, the absolute value of the difference between the second included angle and 90 degrees is smaller than a second preset threshold value, and the absolute value of the first included angle is smaller than the absolute value of the second included angle. It should be noted that the refractive index of the liquid crystal for light is the minimum when the alignment direction of the liquid crystal is parallel to the incident direction of the light, and the refractive index of the liquid crystal for light is the maximum when the alignment direction of the liquid crystal is perpendicular to the incident direction of the light. That is, when the absolute value of the angle between the alignment direction of the liquid crystal and the incident direction of the light is greater than or equal to 0 degree and less than or equal to 90 degrees, the magnitude of the absolute value of the angle between the alignment direction of the liquid crystal and the incident direction of the light is proportional to the refractive index of the liquid crystal, and the larger the absolute value of the angle between the alignment direction of the liquid crystal and the incident direction of the light is, the larger the refractive index of the liquid crystal is, and the smaller the absolute value of the angle between the alignment direction of the liquid crystal and the incident direction of the light is, the smaller the refractive index of the.
The method can control the orientation direction of the liquid crystal when no voltage is applied to be parallel to the incident direction of the light as much as possible, namely, the absolute value of the included angle between the orientation direction of the liquid crystal when no voltage is applied to the liquid crystal and the incident direction of the light is controlled to be smaller than a first preset threshold value, so that the liquid crystal has a smaller refractive index when no voltage is applied to the liquid crystal; the orientation direction of the liquid crystal is controlled to be perpendicular to the incident direction of the light as much as possible when the voltage is applied, namely, the absolute value of an included angle between the orientation direction of the liquid crystal and the incident direction of the light when the voltage is applied is controlled to be smaller than a second preset threshold value, so that the liquid crystal has a larger refractive index when the voltage is not applied, namely, the refractive index of the liquid crystal is larger than that when the voltage is not applied when the voltage is applied.
Preferably, the alignment direction of the liquid crystal when no voltage is applied is parallel to the incident direction of the light, and the alignment direction of the liquid crystal when a voltage is applied is perpendicular to the incident direction of the light. When the orientation direction of the liquid crystal is parallel to the incident direction of the light, the refractive index of the liquid crystal to the light reaches a minimum value, and when the orientation direction of the liquid crystal is perpendicular to the incident direction of the light, the refractive index of the liquid crystal to the light reaches a maximum value. At this time, the difference between the first refractive index and the second refractive index is large, and the refractive index of the display substrate can be ensured to be just between the first refractive index and the second refractive index.
Referring to fig. 2-2, when it is required to control a sub-region of the optical waveguide display device to emit light, a voltage is prohibited from being applied to the liquid crystal 22, at this time, the refractive index of the liquid crystal 22 is smaller than the refractive index of the display substrate 21, the incident angle M of the light emitted from the light source 23 on the display substrate 21 is larger than a predetermined critical angle, and the light emitted from the light source does not satisfy the condition of total reflection on the surface of the display substrate 21, so that the light passes through the display substrate 21 and is emitted out, so that the sub-region emits light. Referring to fig. 2-3, when it is required to control a sub-region in the optical waveguide display device not to emit light, a voltage may be applied to the liquid crystal 22, where the refractive index of the liquid crystal 22 is greater than the refractive index of the display substrate 21, the incident angle M of the light emitted from the light source 23 on the display substrate 21 is greater than a predetermined critical angle, and the light emitted from the light source satisfies a total reflection condition on the surface of the display substrate 21, so that the light is totally reflected on the surface of the display substrate 21, and no light passes through the display substrate 21, so that the sub-region does not emit light.
In summary, the embodiments of the present invention provide a method for manufacturing an optical waveguide display device, in which only liquid crystal is filled between two display substrates, and the liquid crystal has a first refractive index when no voltage is applied and a second refractive index when a voltage is applied. When the light emission of the sub-region in the optical waveguide display device needs to be controlled, the voltage can be prohibited from being applied to the liquid crystal, the refractive index of the liquid crystal is smaller than that of the display substrate, the light emitted by the light source does not meet the condition of total reflection on the surface of the display substrate, and therefore the light can penetrate through the display substrate and is emitted out, so that the sub-region emits light. That is, the invention controls the refractive index of the liquid crystal to be smaller than that of the display substrate, so that the light ray can be emitted from the sub-region on the display substrate without meeting the total reflection condition, and the way of controlling the light emission of the sub-region is enriched.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the manufacturing method of the optical waveguide display device described above may be mutually referred to with the process in the foregoing embodiment of the optical waveguide display device, and the embodiment of the present invention is not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
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| CN201610586466.3A CN106200067B (en) | 2016-07-22 | 2016-07-22 | Optical waveguide display device and its manufacturing method |
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