JP2008242097A - Liquid crystal display device and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which performs a dual view display by using a liquid crystal panel using a cholesteric liquid crystal as an image display means. <P>SOLUTION: A liquid crystal display device 1 includes: a display part 10 which has a cholesteric liquid crystal 13 and generates a display image by controlling a state of the cholesteric liquid crystal layer; and a parallax optical part 20 which is disposed in the front of the display part 10 and has a reflective layer 23 on a surface facing the display part 10. The display part 10 alternately has a pixel region having the cholesteric liquid crystal layer 13 formed therein and a transmissive region which has the cholesteric liquid crystal layer 13 not formed therein and transmissive to light. The parallax optical part 20 has a reflective region having the reflective layer 23 formed therein, in a region facing the transmissive region of the display part 10 and has a transmissive region which has the reflective layer 23 not formed therein and is transmissive to light, in a region facing the pixel region of the display part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device capable of displaying different information in a plurality of directions.

  In a conventional display device such as a liquid crystal display device, a single view display mode in which the same image is observed from any viewing direction with respect to the display unit is generally used. In recent years, in addition to the single view display mode, there has been proposed a display device that can observe different images with respect to each viewing direction when the display unit is observed from different viewing directions. Patent Document 1 discloses a dual view display mode technique that enables different displays to be observed when viewed from the left direction and when viewed from the right direction with respect to the display unit.

  The dual view display in Patent Document 1 will be described with reference to FIG. The display device 100 shown in FIG. 5 has a parallax barrier (parallax barrier) 102 disposed on the front side (display surface side) of a liquid crystal panel 101 as image display means. A backlight 103 is disposed on the back side of the liquid crystal panel 101.

  Light that is emitted from the backlight 103 and passes through pixels in a specific region of the liquid crystal panel 101 (pixels indicated by hatching with a downward slant in the drawing) is given a specific viewing angle by the parallax barrier 102, and Visible only to an observer. On the other hand, light passing through pixels in other specific areas of the liquid crystal panel 101 (pixels indicated by hatched lines rising to the right in the figure) is given a specific viewing angle by the parallax barrier 102 and is given to the left observer. Only visible.

  Light emitted from the backlight 103 and passing through the liquid crystal panel 101 is given a specific viewing angle by the parallax barrier 102 and is output in at least one of the left direction and the right direction. For example, in the configuration of FIG. 5, light that passes through the pixels in the region A is emitted from the liquid crystal panel 101 to the right side in the drawing, and light that passes through the pixels in the region B is emitted from the liquid crystal panel 101 to the left side in the drawing. . As a result, if the pixel corresponding to the region A displays the image A and the pixel corresponding to the region B displays the image B, the respective visual recognitions are obtained when the display unit is observed from different viewing directions. Different images can be displayed with respect to the direction.

In a display having a single view display mode and a dual view display mode, it is possible to perform single view display by setting the image A and the image B to the same display content. On the other hand, when performing dual view display, different information can be displayed simultaneously in two directions by making the image A and the image B have different display contents. As described above, switching between the single view display mode and the dual view display mode can be realized by controlling the display contents of the images A and B.
JP-A-2005-73076 (published on March 17, 2005)

  In the dual view display in Patent Document 1, it is assumed that a normal transmissive liquid crystal panel that controls light transmittance by applying a voltage to the liquid crystal layer is used as the liquid crystal panel 101 that is an image display means. ing. In such a transmissive liquid crystal panel, it is necessary to continue driving the liquid crystal panel 101 in order to maintain display (it is necessary to continue to apply voltage to the liquid crystal layer), and power is consumed during display. It will be.

  On the other hand, as another liquid crystal panel, a liquid crystal panel using a cholesteric liquid crystal having a memory property capable of continuously outputting an image even when the power is turned off is known. In a liquid crystal panel using cholesteric liquid crystal, when the cholesteric liquid crystal is used in a planar state, specific light is selectively reflected, so that it is possible to continue outputting an image even when the power is turned off. For this reason, even in dual view display, it is considered that power consumption can be reduced by using a liquid crystal panel using cholesteric liquid crystal as an image display means.

  However, even if an attempt is made to achieve a dual view display by combining a liquid crystal panel using the cholesteric liquid crystal with a parallax barrier, light irradiated in the direction of the cholesteric liquid crystal is blocked by the parallax barrier, so dual using selective reflection is used. The view display could not be realized.

  The present invention has been made in view of the above-described problems, and an object thereof is to realize a display device that performs dual view display using a liquid crystal panel using cholesteric liquid crystal as an image display means.

  In order to solve the above problems, a liquid crystal display device according to the present invention has a cholesteric liquid crystal layer, a display unit that generates a display image by controlling the state of the cholesteric liquid crystal layer, and a front side of the display unit And a parallax optical unit having a reflective layer on a surface facing the display unit, wherein the display unit includes a pixel region in which the cholesteric liquid crystal layer is formed and the cholesteric liquid crystal layer is formed. The parallax optical unit includes a reflective region in which the reflective layer is formed in a region facing the transmissive region in the display unit, and the display unit includes the reflective region. The region opposite to the pixel region in the part is characterized in that the reflective layer is not formed and a transmission region through which light can pass is provided.

  According to the above configuration, light for image display is provided from the back of the liquid crystal display device, that is, the display unit side, and after passing through the transmission region of the display unit, is reflected by reflection at the reflection region of the parallax optical unit. The pixel region of the display unit is irradiated. The light irradiated to the pixel area of the display portion is selectively reflected or absorbed according to the state of the cholesteric liquid crystal layer in the pixel area. The light reflected by the pixel region of the display unit passes through the transmission region of the parallax optical unit and is output to the outside of the liquid crystal display device. The output display light is output through the transmissive areas of the display unit and the parallax optical unit, thereby giving a specific viewing angle in two different directions.

  As described above, in the liquid crystal display device, the light applied from the back of the device is output by reflection on the display unit and the parallax optical unit, so that the display light is not blocked by the parallax barrier, and the cholesteric liquid crystal is Dual view display can be performed using the liquid crystal panel used.

  In the liquid crystal display device, the reflection layer in the parallax optical unit may be formed of a cholesteric liquid crystal layer.

  According to the above configuration, the reflective layer is a cholesteric liquid crystal layer controlled by orthogonal transparent electrodes, and the reflectance control of light selectively reflected by adjusting the magnitude of the voltage applied to the transparent electrodes. (Multi-gradation display) becomes possible.

  Furthermore, the reflectance control (multi-gradation display) of selectively reflected light is possible by adjusting the magnitude of the voltage applied to the orthogonal transparent electrodes in the cholesteric liquid crystal layer forming the display portion. In other words, by controlling both the reflective layer and the display unit, it is possible to perform dual-gradation display with more gradations using a liquid crystal panel using cholesteric liquid crystal.

  The display device according to the present invention is characterized in that a reflector that can be arranged at an angle with respect to the display surface is provided on one side of the display surface of the liquid crystal display device.

  According to the above configuration, of the two images output from the liquid crystal display device in different directions, one image is directly viewed by the observer, and the other image is reflected by the reflector and is viewed by the observer. It is possible to provide an image providing method such that the image is visually recognized. Thereby, in the said display apparatus, it becomes possible to provide the observer with the information twice as large as the physical size of the said liquid crystal display device at once.

  As described above, the liquid crystal display device according to the present invention includes a cholesteric liquid crystal layer and a display unit that generates a display image by controlling the state of the cholesteric liquid crystal layer, and is disposed on the front side of the display unit. A parallax optical unit having a reflective layer on a surface facing the display unit, and the display unit includes a pixel region in which the cholesteric liquid crystal layer is formed and the cholesteric liquid crystal layer is not formed. The parallax optical unit includes a reflective region in which the reflective layer is formed in a region opposite to the transmissive region in the display unit, and includes pixels in the display unit. In the region opposite to the region, the reflection layer is not formed and a transmission region through which light can be transmitted is provided.

  Therefore, in the liquid crystal display device, the light applied from the back of the device is output by reflection on the display unit and the parallax optical unit, so that the display light is not blocked by the parallax barrier, and cholesteric liquid crystal is used. Dual view display can be performed using a liquid crystal panel. Thereby, there is an effect that the dual view display can be maintained even when the power is turned off.

[Embodiment 1]
An embodiment of the present invention will be described with reference to FIG. First, the configuration of the liquid crystal display device according to the present embodiment will be described with reference to FIG.

  The liquid crystal display device 1 shown in FIG. 1 is generally generated by a display unit 10 including a cholesteric liquid crystal layer capable of selectively reflecting light of a specific color from incident light as an image display unit, and the display unit 10. And a parallax optical unit 20 for separating the two types of images in two different directions. In addition, the parallax optical unit 20 is disposed on the front side (side closer to the observer) with respect to the display unit 10, and the display unit 10 and the parallax optical unit 20 are disposed with a spacer 30 therebetween. .

  Further, a backlight (not shown) serving as a display light generation source is disposed on the back side of the display unit 10. The backlight may be included in the liquid crystal display device 1 or may be externally attached to the liquid crystal display device 1.

  The display unit 10 is configured to have a cholesteric liquid crystal layer 13 between a pair of transparent substrates 11 and 12. On the transparent substrate 11, a concave light shielding layer 14 having a groove in the direction perpendicular to the display surface is formed, and a transparent electrode 15 and a cholesteric liquid crystal layer 13 are formed in the groove of the light shielding layer 14. A transparent electrode 16 is formed on the transparent substrate 12.

  The transparent electrode 16 is a row electrode whose longitudinal direction is the horizontal direction, and the transparent electrode 15 is a column electrode whose longitudinal direction is the vertical direction. That is, the transparent electrode 15 and the transparent electrode 16 are formed to be orthogonal to each other, and the display state of the cholesteric liquid crystal layer 13 is controlled by the voltage applied to the transparent electrode 15 and the transparent electrode 16.

  That is, the cholesteric liquid crystal layer 13 can be in any of a planar state, a focal conic state, and a homeotropic state depending on the voltage applied to the transparent electrode 15 and the transparent electrode 16. The planar state is a state in which light of a specific color is selectively reflected, the focal conic state is a state in which incident light is weakly scattered and transmitted through the cholesteric liquid crystal layer 13, and the homeotropic state is a state in which incident light is weakly scattered. In this state, the light passes through the cholesteric liquid crystal layer 13 without receiving the light. Further, in the planar state or the focal conic state, it is possible to exist stably without applying a voltage to the transparent electrode 15.

  As the voltage applied using the transparent electrode 15 and the transparent substrate 16 is increased, the cholesteric liquid crystal layer 13 is brought into a homeotropic state. Here, when the voltage is suddenly reduced to zero, the state changes to the planar state. Further, when the voltage applied to the cholesteric liquid crystal layer 13 in the homeotropic state is gradually reduced to zero, the state changes to the focal conic state. In the planar state, a desired color (red, green, or blue) can be displayed by light absorption of the dichroic dye. In the focal conic state and the homeotropic state, light passes through the cholesteric liquid crystal layer 13. Since the transmitted light is absorbed by the light shielding layer 14, it is darkly displayed (black display). The cholesteric liquid crystal layer 13 can control the reflectance of light by controlling the applied voltage and the applied voltage pulse width, thereby displaying a halftone.

  As described above, since the liquid crystal display device 1 uses the cholesteric liquid crystal having a memory property in the display unit 10, after the display image is written on the display unit 10, the driving power in the display unit 10 is turned off. However, the written display image can be maintained. At this time, the cholesteric liquid crystal layer 13 controls the application of voltage to the transparent electrode 15 and the transparent substrate 16 so as to be in a planar state or a focal conic state in which the state is maintained even when the power is turned off.

  In the display unit 10, a pixel region in which the cholesteric liquid crystal layer 13 is disposed and a transmissive region in which none of the light shielding layer 14, the transparent electrode 15, and the cholesteric liquid crystal layer 13 are disposed are along the horizontal direction of the display surface. It is formed alternately. In the pixel area and the transmissive area, two pixel areas and one transmissive area are formed in this order. Further, it is preferable that one pixel region and one transmission region have substantially the same width in the horizontal direction.

  Further, in each horizontal column of the display unit 10, one transmissive region and two pixel regions on both sides of the transmissive region form one group. In FIG. 1, the first group and the second group are illustrated, but such a group is continuously formed in the display unit 10. In the two pixel regions in the same group, the cholesteric liquid crystal layer 13 selectively reflects light of the same color system from the incident light. For example, the pixel region in the first group selectively reflects green light, and the pixel region in the second group selectively reflects blue light.

  Then, the manufacturing method of the display part 10 is demonstrated. First, the light shielding layer 14 having a concave groove is formed on the transparent substrate 11. A photolithography method can be used to form such a light shielding layer 14. That is, a photosensitive polymer material is applied on the transparent substrate 11 and exposed and developed so as to form a sidewall pattern in the light shielding layer 14. Further, a photosensitive polymer material is applied so as to be the bottom of the light shielding layer 14, and the bottom is cured by exposure.

  Next, the transparent electrode 15 is formed on the bottom of the light shielding layer 14 by masking the region of the transparent substrate 11 between the light shielding layers 14. Next, cholesteric liquid crystal is dropped into the concave light shielding layer 14 to form the cholesteric liquid crystal layer 13.

  In addition, on the transparent substrate 12, the transparent electrodes 16 are formed in stripes in a direction orthogonal to the transparent electrodes 15. Next, a sealing agent (not shown) is applied to at least one transparent substrate peripheral portion of the transparent substrate 11 or the transparent substrate 12. Next, the transparent substrate 11 and the transparent substrate 12 are laminated and bonded together. Furthermore, ultraviolet rays are irradiated or heated to cure the sealing agent, and the display unit 10 is formed.

  Next, the parallax optical unit 20 is configured to include a reflective layer 23 formed in a row between a transparent substrate 21 and a transparent substrate 22 that form a pair. The reflective layer 23 is formed on the surface facing the display unit 10. Further, a light shielding layer 24 may be formed between the transparent substrate 21 on the front side and the reflective layer 23.

  In the parallax optical unit 20, a reflection region, which is a formation region of the reflection layer 23, and a transmission region where the reflection layer 23 and the light shielding layer 24 are not formed are alternately formed along the horizontal direction of the display surface. Further, the reflection region in the parallax optical unit 20 has substantially the same width as the transmission region or the pixel region in the display unit 10. Furthermore, in the parallax optical unit 20, it is preferable that the transmission region has a width twice that of the reflection region. Further, the reflection region in the parallax optical unit 20 is arranged to face the transmission region in the display unit 10. On the contrary, the pixel region in the display unit 10 faces the transmission region in the parallax optical unit 20.

  Next, the display principle of dual view display in the liquid crystal display device 1 will be described.

  After the writing of the display image to the display unit 10 is completed, display light is incident on the display unit 10 from a backlight (not shown). In FIG. 1, the display lights A to D correspond to these lights. Incident light A and B are transmitted through the transmission region in the first group, and incident light C and D are transmitted through the transmission region in the second group.

  The light transmitted through the transmission region of the display unit 10 is reflected by the reflection layer 23 in the reflection region facing the parallax optical unit 20. Most of the light reflected by the reflective layer 23 is applied to the pixel region of the display unit 10 (a part of the light returns from the transmission region of the display unit 10 to the backlight side). When the cholesteric liquid crystal layer 13 provided in the pixel region of the display unit 10 is in the planar state, light is further reflected by the pixel region. When the cholesteric liquid crystal layer 13 included in the pixel area of the display unit 10 is in the focal conic state, the light irradiated to the pixel area is transmitted through the cholesteric liquid crystal layer 13 and absorbed by the light shielding layer 14.

  The lights A and B reflected by the pixel area of the first group are transmitted through the transmissive areas facing each other in the parallax optical unit 20 and are emitted to the outside of the liquid crystal display device 1 as blue light. Similarly, the lights C and D reflected by the pixel region of the second group pass through the opposing transmission region in the parallax optical unit 20 and are emitted to the outside of the liquid crystal display device 1 as green light.

  The light A in the first group and the light C in the second group are emitted to the left side in the figure, and the light B in the first group and the light D in the second group are emitted to the right side in the figure. Is done. Thereby, in each group of the display unit 10, the first image is displayed in the pixel corresponding to the pixel region on the left side of the transmissive region, and the second image is displayed in the pixel corresponding to the pixel region on the right side of the transmissive region. If the display is performed, different images can be displayed for each viewing direction when the display screen is observed from different viewing directions.

  As described above, in the liquid crystal display device 1 according to the present embodiment, the light for image display is given from the back of the liquid crystal display device, that is, the display unit side, and after passing through the transmission region of the display unit 10, The light is reflected by the reflection region of the parallax optical unit 20 and irradiated to the pixel region of the display unit 10. The light applied to the pixel area of the display unit 10 is selectively reflected or absorbed according to the state of the cholesteric liquid crystal layer 13 in the pixel area. The light reflected by the pixel region of the display unit 10 passes through the transmission region of the parallax optical unit 20 and is output to the outside of the liquid crystal display device. The output display light is output through the transmission regions of the display unit 10 and the parallax optical unit 20, thereby giving a specific viewing angle in two different directions.

  As described above, in the liquid crystal display device 1, since the light provided from the back of the device is output by reflection at the display unit 10 and the parallax optical unit 20, the display light is not blocked by the parallax barrier and is cholesteric. Dual view display can be performed using a liquid crystal panel using liquid crystal.

  The cholesteric liquid crystal layer 13 in each region in the display unit 10 is in one of a planar state and a focal conic state in which the state is maintained even when the power is turned off, and the light reflected by the display unit 10 is a parallax optical unit. 20 is emitted simultaneously in two different directions. Therefore, by storing different information in the pixel area that emits light in the left direction and the pixel area that emits light in the right direction, the dual view can be performed with the power of the liquid crystal display device 1 turned off. The display can be continued.

[Embodiment 2]
Another embodiment of the present invention will be described below with reference to FIG. Here, only differences from the first embodiment will be described, and the same components will be denoted by the same reference numerals and detailed description thereof will be omitted.

  The liquid crystal display device 2 shown in FIG. 2 is generally generated by the display unit 10 including a cholesteric liquid crystal layer capable of selectively reflecting light of a specific color from incident light as an image display unit. And a parallax optical unit 40 for separating two kinds of images in two different directions. Further, the parallax optical unit 40 is arranged on the front side (side closer to the observer) with respect to the display unit 10, and the display unit 10 and the parallax optical unit 40 are arranged via the spacer 30 therebetween. . That is, the liquid crystal display device 2 has a configuration in which the parallax optical unit 20 in the liquid crystal display device 1 shown in FIG.

  The parallax optical unit 40 is configured to include a cholesteric liquid crystal layer 43 between a transparent substrate 41 and a transparent substrate 42 that form a pair. On the transparent substrate 41, a concave light shielding layer 44 having a groove in the direction perpendicular to the display surface is formed. In the groove of the light shielding layer 44, a transparent electrode 45 and a cholesteric liquid crystal layer 43 are formed. A transparent electrode 46 is formed on the transparent substrate 42.

  The transparent electrode 46 is a row electrode whose longitudinal direction is the horizontal direction, and the transparent electrode 45 is a column electrode whose longitudinal direction is the vertical direction. That is, the transparent electrode 45 and the transparent electrode 46 are formed to be orthogonal to each other, and the state of the cholesteric liquid crystal layer 43 is controlled by a voltage applied to the transparent electrode 45 and the transparent electrode 46.

  In the parallax optical unit 40, the voltage applied to the transparent electrode 45 and the transparent electrode 46 is controlled, and the cholesteric liquid crystal layer 43 is brought into a planar state, so that the cholesteric liquid crystal layer 43 and the reflective layer 23 in the parallax optical unit 20 Equivalent functions can be given.

  Therefore, the liquid crystal display device 2 shown in FIG. 2 is almost similar to the liquid crystal display device 1 shown in FIG. 1 except that the reflection region in the parallax optical unit 40 is constituted by the cholesteric liquid crystal layer 43 maintained in a planar state. The dual view display can be realized by the same display principle as the liquid crystal display device 1. Further, the parallax optical unit 40 can be manufactured by a method similar to the method for manufacturing the display unit 10 described in the first embodiment.

  Further, in the liquid crystal display device 2, the reflection region in the parallax optical unit 40 is configured by the cholesteric liquid crystal layer 43 maintained in the planar state, so that light of a specific color can be selectively reflected also in the cholesteric liquid crystal layer 43. .

  The cholesteric liquid crystal layer 43 in the reflection region of the parallax optical unit 40 can be controlled by the transparent electrode 45 and the transparent electrode 46 orthogonal to each other, and the reflectance of light selectively reflected by adjusting the magnitude of the applied voltage. Is controlled to enable multi-gradation display.

  Further, the cholesteric liquid crystal layer 13 forming the display unit 10 can also be controlled by the transparent electrode 15 and the transparent electrode 16 which are orthogonal to each other, and the reflectance of light selectively reflected by adjusting the magnitude of the applied voltage. Is controlled to enable multi-gradation display.

  That is, by controlling the light reflectance at the cholesteric liquid crystal layer 43 and the light reflectance at the cholesteric liquid crystal layer 13, dual view display with more gradations can be performed.

  For example, when the external environment of the liquid crystal display device 2 is bright, the light reflectance at the cholesteric liquid crystal layer 43 is increased, and bright multi-gradation display is possible with the liquid crystal display device 2. When the external environment of the liquid crystal display device 2 is dark, the light reflectivity at the cholesteric liquid crystal layer 43 is lowered, and a dark multi-gradation display is possible with the liquid crystal display device 2. As described above, the display of the liquid crystal display device 2 can be controlled more finely according to the state of the external environment, and the visibility of the user can be improved.

[Embodiment 3]
Another embodiment of the present invention will be described below with reference to FIGS. A display device 60 shown in FIG. 3 includes the liquid crystal display device 1 described in the first embodiment and a reflection plate 61. In the display device 60, the reflection plate 61 is attached via a hinge portion 62 at the left end or the right end of the liquid crystal display device 1 so as to be detachable or movable with respect to the liquid crystal display device 1. FIG. 3 is a top view of the display device 60, and the reflection plate 61 is attached to the left end of the liquid crystal display device 1. In the display device 60, the liquid crystal display device 2 described in the second embodiment may be used instead of the liquid crystal display device 1.

  As shown in FIG. 4A, the reflecting plate 61 is movable between I and II in the figure by the hinge portion 62, and the user narrows or widens the interval between the liquid crystal display device 1 and the reflecting plate 61. It is possible to For this reason, it becomes possible to adjust the reflective display direction so that the right-side display by the liquid crystal display device 1 is all reflected and displayed by the reflector 61.

  As shown in FIG. 4B and FIG. 4C, the hinge portion 62 includes a hinge recess 63 and a hinge projection 64, and the hinge recess 63 and the hinge projection 64 are detachable. . The hinge recess 63 is provided in the liquid crystal display device 1 as shown in FIG. 4B, and the hinge protrusion 64 is provided in the reflector 61 as shown in FIG. 4C. If the reflection plate 61 is unnecessary when viewing the liquid crystal display device 1, the interval between the liquid crystal display device 1 and the reflection plate 61 can be increased, or the reflection plate 61 can be removed from the liquid crystal display device 1.

  The liquid crystal display device 1 is capable of dual view display as described in the first embodiment, and the image output to the right side of the screen and the image output to the left side of the screen can be different.

  As shown in FIG. 3, when the reflector 61 is opened at a predetermined angle with respect to the liquid crystal display device 1, an image output in the left direction from the liquid crystal display device 1 is displayed by an observer on the right side of the screen. Directly visible. On the other hand, an image output in the right direction from the liquid crystal display device 1 is reflected by the reflector 61, and the reflected image is recognized by the observer as a virtual image ahead of the reflector 61. For this reason, the observer can view information twice as large as the physical size of the liquid crystal display device 1 at a time by the reflection display and the leftward display image reflected by the reflection plate 61.

  In addition, when the display device 60 according to the present embodiment is used as a TV display device, the information of the first channel is displayed by the reflection display of the reflection plate 61 in the double physical size display using the reflection plate 61. The information on the second channel can be displayed by the left side display of the liquid crystal display device 1. That is, it is possible to display information on two channels at a time.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope shown in the claims, and an implementation obtained by appropriately combining technical means disclosed in the embodiment. The form is also included in the technical scope of the present invention.

  The display of the present invention can be widely used as a display for information equipment, a TV, a display in a steerable moving body such as a car or a ship.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention and is a diagram illustrating a configuration of a main part of a liquid crystal display device according to a first embodiment. FIG. 3 is a diagram illustrating a configuration of a main part of a liquid crystal display device according to a second embodiment, illustrating an embodiment of the present invention. FIG. 9 is a diagram illustrating a configuration of a main part of a display device according to a third embodiment of the present invention. FIGS. 4A to 4C are diagrams illustrating a configuration of a main part of a mounting portion between the liquid crystal display device and the reflection plate in the display device according to the third embodiment. It is a figure which shows the provision effect of the viewing angle by a parallax barrier in the display apparatus which performs a dual view display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Liquid crystal display device 10 Display part 13 Cholesteric liquid crystal layer 14 Light shielding layer 20, 40 Parallax optical part 23 Reflective layer 24 Light shielding layer 43 Cholesteric liquid crystal layer 44 Light shielding layer 60 Display apparatus 61 Reflecting plate

Claims (4)

A display unit having a cholesteric liquid crystal layer and generating a display image by controlling a state of the cholesteric liquid crystal layer;
A parallax optical unit disposed on the front side of the display unit and having a reflective layer on a surface facing the display unit;
The display unit alternately includes a pixel region in which the cholesteric liquid crystal layer is formed and a transmission region in which the cholesteric liquid crystal layer is not formed and light can be transmitted.
The parallax optical unit has a reflective region in which the reflective layer is formed in a region opposite to the transmissive region in the display unit, and the reflective layer is not formed in a region opposite to the pixel region in the display unit. A liquid crystal display device having a transmission region through which light can pass.   The liquid crystal display device according to claim 1, wherein the reflective layer in the parallax optical unit is formed of a cholesteric liquid crystal layer.   3. A display device comprising a reflection plate arranged on one side of the display surface of the liquid crystal display device according to claim 1 so as to form an angle with respect to the display surface.   The display device according to claim 3, wherein the reflection plate is detachably or movably attached to the liquid crystal display device.

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