JP2017146529A - Reflection type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type liquid crystal display device which can improve light use efficiency by eliminating the waste of light from a light source, and improve the contrast and appearance of an image by suppressing unnecessary light generation.SOLUTION: The reflection type liquid crystal display device includes: a reflection type liquid crystal display element; a light source that supplies light to the reflection type liquid crystal display element; a polarization member that, of polarization components included in the light emitted from the light source, transmits a first polarized light with a predetermined polarization axis and blocks a second polarized light with a polarization axis different from that of the first polarized light; and a first reflection type polarization member that reflects the first polarized light having passed through the polarization member toward the reflection type liquid crystal display element and transmits the second polarized light emitted from the reflection type liquid crystal display element. In an outer peripheral region surrounding the image display region of the reflection type liquid crystal display element, a second reflection type polarization member which reflects the first polarized light and transmits the second polarized light is disposed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a liquid crystal display device used in a digital camera or the like, and more particularly to a reflective liquid crystal display device in which a display element is a reflective liquid crystal display element.

  In a conventional reflective liquid crystal display device, in order to improve the appearance of the image of the reflective liquid crystal display element, a metal plate that generally covers the upper part of the outer peripheral area surrounding the image display area of the reflective liquid crystal display element Etc. are subjected to a light-shielding treatment such as black coating on the surface thereof and installed as a light-shielding member. On the other hand, there is a problem in that sunlight is reversely incident and the light shielding member is damaged by heat. Therefore, as a countermeasure, a reflective liquid crystal display device having a surface reflectance of 20% or more for incident light of the light shielding member is used. It has been proposed (see Patent Document 1).

JP 2003-161915 (second page, FIG. 1)

  However, in light of the demand for higher image brightness and lower power consumption of the device, the outer peripheral area surrounding the image display area of the reflective liquid crystal display element is subjected to a light shielding process such as black coating on the surface of a metal plate or the like. In the conventional reflection type liquid crystal display device in which the members are arranged, the light incident on the light shielding member is absorbed therein, so that there is a problem that the light use efficiency is low. On the other hand, in the conventional reflection type liquid crystal display device shown in Patent Document 1, it can be said that the light use efficiency is high because the surface reflectance of the light shielding member is set to 20% or more. There is a problem that unnecessary polarized light whose polarization state has changed is reflected on the surface of the light shielding member to reduce the contrast of the image of the reflective liquid crystal display element, and that the surface state of the light shielding member becomes easy to see and the appearance is poor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a reflective liquid crystal display device capable of improving the light utilization efficiency by using light from a light source without waste and suppressing the generation of unnecessary light and improving the contrast and appearance of an image. Is to provide.

  The reflective liquid crystal display device of the present invention employs the following configuration in order to achieve the above object.

  A reflection-type liquid crystal display element; a light source that supplies light to the reflection-type liquid crystal display element; and a first polarized light having a predetermined polarization axis among the polarization components contained in the light emitted from the light source. A polarizing member for blocking the second polarized light having a polarization axis different from that of the first polarized light, and the first polarized light transmitted through the polarizing member is reflected toward the reflective liquid crystal display element and emitted from the reflective liquid crystal display element. And a first reflective polarizing member that transmits the second polarized light. The reflective liquid crystal display device reflects the first polarized light to an outer peripheral region surrounding the image display region of the reflective liquid crystal display element. In addition, a second reflective polarizing member that transmits the second polarized light is arranged.

  According to such a configuration, the second reflective polarizing member that reflects the first polarized light and transmits the second polarized light having a polarization axis different from that of the first polarized light, surrounds the image display region. By using it as a light-shielding member arranged in the area, the image display area is irradiated with the first polarized light without waste, thereby improving the light utilization efficiency, and the influence of the unnecessary second polarized light generated by irregular reflection of light or the like. By reducing it, it is possible to improve the contrast and appearance of the image.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, a light shielding member may be disposed in a region facing the first reflective polarizing member with the second reflective polarizing member interposed therebetween.

  In this way, even if the second polarized light generated by irregular reflection or the like is transmitted through the second reflective polarizing member, it is absorbed by the light shielding member, so that the contrast of the image can be improved.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, the light shielding member may be laminated on the second reflective polarizing member.

  In this case, the light transmitted through the second reflective polarizing member is absorbed without leakage of light from between the second reflective polarizing member and the light shielding member, so that the contrast of the image can be improved.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, the second reflective polarizing member may be disposed in a region adjacent to the polarizing member in an outer peripheral region surrounding the image display region.

  In this way, the first polarized light reflected by the second reflective polarizing member adjacent to the polarizing member is easily reflected upward, and is again directed to the image display region by the first reflective polarizing member. Therefore, the first polarized light can be irradiated to the image display region of the reflective liquid crystal display element without waste.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, the second reflective polarizing member may be disposed in the entire outer peripheral region surrounding the image display region.

  In this way, even if the first polarized light diffused and radiated from the polarizing member and the first polarized light reflected from the first reflective polarizing member irradiate the outer peripheral region surrounding the image display region, the first polarized light is emitted. The polarized light is reflected by the second reflective polarizing member and reaches the image display region, so that the light use efficiency can be improved.

  In addition to the above configuration, a reflective liquid crystal display device according to the present invention includes a casing disposed so as to cover the reflective liquid crystal display element, and reflects the first polarized light on the inner surface of the casing. You may arrange | position the 3rd reflective polarizing member which permeate | transmits 2 polarized light.

  According to this configuration, the third reflective polarizing member disposed on the inner surface of the housing converts the first polarized light diffusely radiated from the polarizing member and the first polarized light reflected from the first reflective polarizing member. Reflecting to irradiate the image display area of the reflective liquid crystal display element and improving the light utilization efficiency, it is possible to improve the contrast of the image by transmitting the second polarized light generated by irregular reflection or the like Become.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, the third reflective polarizing member may be disposed on the wall surface of the casing surrounding the reflective liquid crystal display element among the inner surfaces of the casing. .

  If it does in this way, even if the 1st polarization | polarized-light radiated | emitted from the polarizing member reaches the wall surface of a housing | casing, it will reflect so that it may irradiate the image display area | region of a reflection type liquid crystal display element, and the utilization efficiency of light will be improved. It becomes possible.

  In the reflective liquid crystal display device according to the present invention, in addition to the above configuration, the housing has a protruding portion that covers an outer peripheral region surrounding the image display region, and the third reflective polarizing member is formed on the inner surface of the housing. Of these, it may be arranged on the surface of the protruding portion.

  In this way, even if the first polarized light diffusing and radiating from the polarizing member reaches the protrusion that covers the outer peripheral region surrounding the image display region, it is reflected so as to irradiate the image display region of the reflective liquid crystal display element. Light utilization efficiency can be improved.

  In the reflection type liquid crystal display device according to the present invention, in addition to the above configuration, the protrusion of the housing is provided so as to cover a region adjacent to the polarizing member in the outer peripheral region surrounding the image display region, and the third reflection The type polarizing member may be disposed on the surface of the protruding portion of the casing provided so as to cover the area adjacent to the polarizing member in the outer peripheral area surrounding the image display area in the inner surface of the casing.

  In this way, even if the first polarized light diffused and radiated from the polarizing member reaches the protrusion that covers the region adjacent to the polarizing member in the outer peripheral region surrounding the image display region, the image display region of the reflective liquid crystal display element It is possible to improve the light utilization efficiency by reflecting the light so as to irradiate the light.

  As described above, according to the reflective liquid crystal display device of the present invention, the second reflective polarizing member that reflects the first polarized light and transmits the second polarized light having a different polarization axis is used as the light shielding member. By disposing the outer peripheral area surrounding the image display area of the liquid crystal display element, the first display light can be irradiated to the image display area of the reflective liquid crystal display element without waste, and the light use efficiency can be improved. It is possible to improve the appearance and contrast of the image by reducing the influence of the unnecessary second polarized light generated by the irregular reflection or the like.

It is a perspective view for demonstrating the external appearance of 1st Embodiment of the reflection type liquid crystal display device of this invention. It is a disassembled perspective view for demonstrating the structure of 1st Embodiment of the reflection type liquid crystal display device of this invention. It is sectional drawing of the cross section AA shown in FIG. 1 for demonstrating 1st Embodiment of the reflective liquid crystal display device of this invention. It is sectional drawing of the cross section BB shown in FIG. 1 for demonstrating 1st Embodiment of the reflective liquid crystal display device of this invention. It is sectional drawing of the same cross section AA as FIG. 3 for demonstrating 2nd Embodiment of the reflection type liquid crystal display device of this invention. It is a partial disassembled perspective view of the housing | casing for demonstrating the structure of 3rd Embodiment of the reflection type liquid crystal display device of this invention. It is sectional drawing of the same cross section AA as FIG. 3 for demonstrating 3rd Embodiment of the reflection type liquid crystal display device of this invention. It is sectional drawing of the same cross section BB as FIG. 4 for demonstrating 3rd Embodiment of the reflective liquid crystal display device of this invention.

  The reflective liquid crystal display device of the present invention is characterized in that a light shielding member that covers an outer peripheral region surrounding the image display region of the reflective liquid crystal display element, that is, a so-called parting mask is formed of a reflective polarizing member. is there.

  Hereinafter, three embodiments of the reflective liquid crystal display device of the present invention will be described in detail with reference to the drawings. First, the first embodiment will be described with reference to FIGS. Next, a second embodiment will be described with reference to FIG. The third embodiment will be described with reference to FIGS. In addition, in each figure, the same number is attached | subjected to the same structural member, and the overlapping description is abbreviate | omitted.

In the first embodiment, an example of a reflective liquid crystal display device in which a light shielding member that covers an outer peripheral region surrounding an image display region of a reflective liquid crystal display element is formed of a reflective polarizing member is shown.
The second embodiment shows an example of a reflective liquid crystal display device in which a light shielding member that covers an outer peripheral region surrounding an image display region of a reflective liquid crystal display element is formed of two types of laminated members.
In the third embodiment, the reflective liquid crystal in which the reflective polarizing member is disposed on the surface of the protruding portion of the casing that covers the region adjacent to the polarizing member in the outer peripheral region surrounding the image display region of the reflective liquid crystal display element. An example of a display device is shown.

[Description of First Embodiment of Reflective Liquid Crystal Display Device of the Present Invention: FIGS. 1 to 4]
First, a first embodiment of a reflective liquid crystal display device of the present invention will be described with reference to FIGS. 1 is an external perspective view of the reflective liquid crystal display device, FIG. 2 is an exploded perspective view of the reflective liquid crystal display device, and FIG. 3 is a side view of the reflective liquid crystal display device shown in FIG. FIG. 4 is a cross-sectional view taken along the line BB from the front direction of the reflective liquid crystal display device shown in FIG.

  As shown in FIG. 1, the reflective liquid crystal display device 100 according to the first embodiment includes a circuit board 1, a case 2, and a first reflective polarizing plate 11. An image is captured by observing the transmitted light P from above with the pupil EP. The light P may be viewed directly with the pupil EP, an eyepiece lens may be disposed and viewed therethrough, or may be projected onto a screen.

  As shown in FIG. 2, the circuit board 1 is mounted with a reflection type liquid crystal display element 3 and a light source 4, and a connector (not shown) and an FPC that are connected to an external control circuit that electrically controls both of them. Yes. The reflective liquid crystal display element 3 preferably uses LCOS (Liquid crystal on silicon).

  The frame 5 is positioned by the guide hole of the circuit board 1 and fixed with a silicone-based adhesive, and the second reflective polarizing plate 12 having the window portion 121 is disposed above the reflective liquid crystal display element 3. A mask that covers the outer peripheral region surrounding the image display region 31 is formed, and is fixedly disposed on the frame 5 with a double-sided adhesive tape attached to the back surface thereof. In particular, it is desirable that the portion 122 of the second reflective polarizing plate 12 serving as a mask is disposed as close as possible to a portion near the window 61 of the reflector 6.

  On the reflector 6, the diffusion plate 9 and the polarizing plate 7 are overlapped and disposed on the window portion 61 of the reflector 6. In the housing 8, the first reflective polarizing plate 11 is placed between the case 2 and the housing 8 so as to be curved along the curved edge 81 at the top of the housing 8. The mold polarizing plates 13 and 14 are disposed by being bonded to the three surfaces including the inner wall 82 of the housing 8. The first reflective polarizing plate 11, the second reflective polarizing plate 12, and the third reflective polarizing plates 13 and 14 described above reflect one polarized light, and the vibration direction (polarization axis) is orthogonal to it. It has the same function as the polarizing beam splitter that transmits the other polarized light. For example, it is preferable to use WGF (wire grid polarizing film), but it is a reflective polarizing plate having a dielectric multilayer structure, and a block-shaped reflective type. It may be a polarizing member, a thin-film reflective polarizing member formed on the surface of the housing 8 or the like. In particular, with respect to the second reflective polarizing plate 12 used as a mask, if the original function as a light shielding mask is enhanced, a material having a high degree of polarization is used to increase the contrast with the first reflective polarizing plate 11. In order to increase the light utilization efficiency, it is preferable to use one having a high light reflectance. As for the first reflective polarizing plate 11, a thin and flexible film such as a TAC film is preferable as a base material if it is used while being curved.

  The reflector 6, the housing 8, the circuit board 1, and the frame 5 in which the respective members are incorporated are integrated by fitting the reflector 6 and the housing 8 with a hook, and then fitted into the case 2 and fixed with the hook. And integrated. Next, the case 2 is fitted into the frame 5 and fixed and integrated with a hook, whereby the reflective liquid crystal display device 100 shown in FIG. 1 is configured.

  Therefore, the reflective liquid crystal display device 100 includes the reflector 6 disposed on the light source 4 and includes the second reflective polarizing plate 12 disposed as a mask on the reflective liquid crystal display element 3. 8, a closed space surrounded by the first reflective polarizing plate 11 and the third reflective polarizing plates 13, 14 is formed, and the reflector 6 and the housing 8 are connected to the case 2 and the frame 5. The circuit board 1 is covered to prevent light leakage and external light intrusion.

  As shown in FIG. 3, the outgoing light OL indicated by the large arrow emitted from the light source 4 is changed in the direction perpendicular to the reflector 6 so that the reflected light RL enters the diffuser plate 9 and becomes uniform diffused light. The light passes through and becomes linearly polarized light S indicated by a large arrow. Hereinafter, the linearly polarized light S is referred to as polarized light S, and the linearly polarized light whose vibration direction is orthogonal to the polarized light S is referred to as polarized light P.

  As described above, the first reflective polarizing plate 11 reflects one linearly polarized light and transmits the other linearly polarized light whose vibration direction is orthogonal to the first polarized light, that is, reflects the polarized light S indicated by a large arrow, It has a function of a polarizing beam splitter that transmits the polarized light P, and its shape is curved along the curved edge 81 (see FIG. 2) of the housing 8 to form a kind of concave mirror. Due to the characteristics and shape of the first reflective polarizing plate 11, most of the polarized light S diffused and radiated from the polarizing plate 7 is set to enter the image display region 31 of the reflective liquid crystal display element 3. Further, the curved shape toward the bottom of the first reflective polarizing plate 11 also has a feature that makes the reflective liquid crystal display device 100 low.

  The polarized light S that has reached the image display region 31 of the reflective liquid crystal display element 3 is controlled by a control circuit (not shown) that controls the reflective liquid crystal display element 3 (for example, a semiconductor circuit built in the LCOS). Is modulated by performing a predetermined light modulation operation, and is converted into polarized light P indicated by a large arrow in accordance with image data. Then, this polarized light P is transmitted through the first reflective polarizing plate 11, is emitted from the window portion 21 of the case 2, and becomes light P that is observed at the pupil EP as an image. The first reflective polarizing plate transmits only the polarized light P modulated by light in the image display region 31 irradiated with as much polarized light S as possible, and absorbs the polarized light P generated by irregular reflection or the like. If the polarizing plate is not transmitted, an image with good appearance without noise can be obtained.

  The second reflective polarizing plate 12 is arranged so as to cover the outer peripheral region surrounding the image display region 31 of the reflective liquid crystal display element 3, and as a parting to improve the appearance of the image display region 31 of the reflective liquid crystal display element 3. The mask is formed.

  That is, the polarized light S reaching the second reflective polarizing plate 12 includes the polarized light S reflected from the first reflective polarizing plate 11 and the polarized light S indicated by a small arrow directly diffused from the polarizing plate 7. The first reflection type polarizing plate 11 is reflected by the second reflection type polarizing plate 12 and remains as the polarized light S, and at least a part of the reflection type liquid crystal display element is reflected and not transmitted to the outside. 3 is used to irradiate three image display areas 31. In particular, the polarized light S from the polarizing plate 7 that directly irradiates a portion 122 of the second reflective polarizing plate 12 in the region adjacent to the polarizing plate 7 in the outer peripheral region surrounding the image display region 31 of the reflective liquid crystal display element 3 is: It is easily reflected toward the upper part, re-reflected by the first reflective polarizing plate 11 and easily incident on the image display region 31, thereby contributing to the improvement of the light utilization efficiency.

  Even if the polarized light P due to the irregular reflection of light is generated in the closed space of the housing 8, the polarized light P transmitted through the second reflective polarizing plate 12 is outside the closed space and the outer peripheral portion of the reflective liquid crystal display element 3. It is absorbed by the surface of the frame 5 and the circuit board 1 and does not reach the first reflective polarizing plate 11, and the contrast and appearance of the image are improved.

  On the inner wall of the housing 8 facing the polarizing plate 7, a third reflective polarizing plate 14 is disposed. The third reflective polarizing plate 14 has the same characteristics as the first reflective polarizing plate 11 described above, and is indicated by a small arrow that is emitted from the polarizing plate 7 and reaches the third reflective polarizing plate 14. All of the polarized light S is reflected and contributes to irradiating the image display region 31 of the reflective liquid crystal display element 3, thereby improving the light use efficiency.

  As shown in FIG. 4, the third reflective polarizing plate 13 is disposed on each of the left and right inner walls 82 of the housing 8. This third reflective polarizing plate 13 reflects and diffuses all the polarized light S indicated by the small arrow that diffuses and radiates from the polarizing plate 7 and reaches the third reflective polarizing plate 13, thereby displaying an image on the reflective liquid crystal display element 3. This contributes to irradiating the region 31 and improves the light utilization efficiency.

  That is, the polarized light S diffused and radiated from the polarizing plate 7 into the closed space surrounded by the first reflective polarizing plate 11, the second reflective polarizing plate 12, and the third reflective polarizing plates 13 and 14 is reflected. Except for being used for irradiating the image display area 31 of the liquid crystal display element 3, all of the light is reflected inside, and at least a part thereof is used as polarized light S for irradiating the image display area 31. Then, only the polarized light P that has been light-modulated and emitted from the image display region 31 passes through the first reflective polarizing plate 11 and is observed as an image on the pupil EP. Even if light is irregularly reflected in the closed space and becomes polarized light P, the second reflective polarizing plate 12 and the third reflective polarizing plates 13 and 14 occupying most of the closed space have polarized light P. Is transmitted and absorbed outside the closed space, and is hardly transmitted and emitted through the first reflective polarizing plate 11. Therefore, it is possible to provide a reflective liquid crystal display device 100 with improved light utilization efficiency and good image contrast and appearance.

[Description of Second Embodiment of Reflective Liquid Crystal Display Device of the Present Invention: FIG. 5]
Next, a second embodiment of the reflective liquid crystal display device of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view taken along the line AA of the reflective liquid crystal display device similar to FIG. 3 of the first embodiment described above, and is a cross-sectional view for explaining the second embodiment. In addition, in each figure, the same number is attached | subjected to the same structural member, and the overlapping description is abbreviate | omitted.

  The reflective liquid crystal display device 200 according to the second embodiment is that the mask that covers the outer peripheral region surrounding the image display region 31 of the reflective liquid crystal display element 3 is formed of two types of stacked members. The configuration is the same as the other embodiments except for the other configurations.

  As shown in FIG. 5, a laminated light shielding member that covers an outer peripheral region surrounding the image display region 31 is disposed on the reflective liquid crystal display element 3. As a configuration of the laminated light shielding member, a light shielding plate 16, for example, a thin metal plate coated with black, is disposed immediately above the reflective liquid crystal display element 3, and a second reflective polarizing plate 12 is disposed thereon. Be placed. In other words, the light shielding plate 16 is disposed in a region facing the first reflective polarizing plate 11 with the second reflective polarizing plate 12 interposed therebetween. Since the light shielding plate 16 may be laminated with the reflective polarizing plate 12, a black film, a printed resin mask directly formed on an LCOS glass substrate, or the like can be freely selected in addition to the black coated metal thin plate. .

  By laminating the second reflective polarizing plate 12 and the light shielding plate 16, no light leaks between them, and even if light is diffusely reflected inside the housing 8 and polarized light P is generated, the polarized light P is Since the light passes through the second reflective polarizing plate 12 and is absorbed by the light shielding plate 16, the reflective liquid crystal display device 200 with good image contrast and appearance can be provided.

  That is, by disposing the light shielding plate 16 that absorbs the polarized light P transmitted through the second reflective polarizing plate 12, unnecessary polarized light P can be reliably absorbed, and the contrast and appearance of the image are further improved. The reflective liquid crystal display device 200 can be provided. Furthermore, the inner wall of the housing 8 in which the third reflective polarizing plates 13 and 14 are arranged is also made of a material and color that absorbs the polarized light P transmitted through the third reflective polarizing plates 13 and 14, If a light shielding member similar to the light shielding plate 16 is disposed, the contrast and appearance of the image are further improved.

[Description of Third Embodiment of Reflective Liquid Crystal Display Device of the Present Invention: FIGS. 6 to 8]
Next, a third embodiment of the reflective liquid crystal display device of the present invention will be described with reference to FIGS. A difference from the first embodiment is that a protrusion 83 is formed in the housing 8 at an adjacent portion of the polarizing plate 7 and the second reflective polarizing plate 12 to cover the outer peripheral portion of the second reflective polarizing plate 12. This is the point that the third reflective polarizing plate 15 is arranged on the surface of the protruding portion 83.

  FIG. 6 is a partially exploded perspective view in which a housing and a reflective polarizing plate disposed therein are picked up from the exploded perspective view of the reflective liquid crystal display device shown in FIG. FIG. 7 is a cross-sectional view taken along the line AA, similar to FIG. 3 of the first embodiment described above. FIG. 8 is a cross-sectional view taken along the line BB similar to FIG. 4 of the first embodiment described above. In addition, in each figure, the same number is attached | subjected to the same structural member, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, in the third embodiment, a protruding portion 83 is formed like a ridge on the lower part (beam) of the window frame of the housing 8 on which the polarized light S from the reflector 6 (see FIG. 2) enters. A third reflective polarizing plate 15 is provided on the upper surface of the projecting portion 83. Accordingly, the housing 8 is provided with the first reflective polarizing plate 11 on the top, the third reflective polarizing plates 13 and 14 on the inner wall, and the third reflective polarizing plate 15 on the protruding portion 83. .

  As shown in FIG. 7, in the reflective liquid crystal display device 300 according to the third embodiment, the protruding portion 83 of the housing 8 is in an area adjacent to the polarizing plate 7 and surrounds the image display area 31. It is formed like a ridge that covers the outer peripheral portion of the second reflective polarizing plate 12 disposed in the area. This conceals the boundary between the second reflective polarizing plate 12 and the frame 5, eliminates the generation and movement of dust from the gap, and has the effect of preventing the second reflective polarizing plate 12 from floating. . A third reflective polarizing plate 15 is disposed on the surface of the protruding portion 83.

  Similar to the first embodiment described with reference to FIG. 3, the outgoing light OL emitted from the light source 4 is incident on the diffusion plate 9 and becomes uniform diffused light, which is transmitted through the polarizing plate 7 to become polarized light S, thereby forming the housing 8. To the closed space. The difference from the first embodiment is that the polarized light S diffused and radiated from the polarizing plate 7 is reflected by the third reflective polarizing plate 15 disposed in the protrusion 83 in the region closest to the polarizing plate 7. is there. The polarized light S from the polarizing plate 7 that is directly incident on the third reflective polarizing plate 15 is easily reflected upward by the third reflective polarizing plate 15 and re-reflected by the first reflective polarizing plate 11. This reaches the image display area 31 and contributes to the improvement of the light utilization efficiency.

  As shown in FIG. 8, in the reflective liquid crystal display device 300, the first reflective polarizing plate 11, the second reflective polarizing plate 12, and the third reflective are the same as in the first embodiment of FIG. The polarized light S diffused and radiated from the polarizing plate 7 into the closed space surrounded by the polarizing plates 13 and 14 irradiates the image display region 31 of the reflective liquid crystal display element 3, and all other polarized light S is inside the closed space. Then, it is reflected again as polarized light S indicated by a small arrow, and is reused as polarized light S that irradiates the image display region 31.

  Further, the third reflective polarizing plate 15 disposed on the surface of the protruding portion 83 so as to reach the left and right inner walls 82 of the housing 8 is disposed in the vicinity of the polarizing plate 7 so as to be the first reflective polarized light. The polarized light S is reflected toward the plate 11 and re-reflected by the first reflective polarizing plate 11 to irradiate the image display region 31, thereby contributing to the improvement of light utilization efficiency.

  Then, only the polarized light P indicated by the large arrow light-modulated in the image display area 31 and emitted therefrom is transmitted through the first reflective polarizing plate 11 and observed as an image on the pupil EP. Even if light is irregularly reflected in the closed space and becomes polarized light P, the second reflective polarizing plate 12 and the third reflective polarizing plates 13, 14, and 15 occupying most of the closed space have polarized light P. The contrast of the image without being transmitted and absorbed by the outer periphery of the reflective liquid crystal display element 3, the frame 5, the surface of the circuit board 1, and the like through the first reflective polarizing plate 11. The reflective liquid crystal display device 300 with good appearance can be provided.

  The present invention is not limited to the above-described embodiments of the reflective liquid crystal display device, and it is not necessary to have all of these configurations, and various modifications and omissions can be made without departing from the spirit of the present invention. It goes without saying that you can do it.

DESCRIPTION OF SYMBOLS 1 Circuit board 2 Case 3 Reflective liquid crystal display element 4 Light source 5 Frame 6 Reflector 7 Polarizing plate 8 Case 9 Diffusion plate 11 1st reflective polarizing plate 12 2nd reflective polarizing plates 13, 14, 15 3rd Reflective polarizing plate 16 Light-shielding plate 21, 61, 121 Window 31 Image display area 81 Curved edge 82 Inner wall 83 Projection 100, 200, 300 Reflective liquid crystal display

Claims (9)

A reflective liquid crystal display element;
A light source for supplying light to the reflective liquid crystal display element;
Of the polarization components contained in the light emitted from the light source, the polarized light that transmits the first polarized light having a predetermined polarization axis and blocks the second polarized light having a polarization axis different from the first polarized light. A first reflective type that reflects the first polarized light transmitted through the member and the polarizing member toward the reflective liquid crystal display element and transmits the second polarized light emitted from the reflective liquid crystal display element A polarizing member;
In a reflective liquid crystal display device comprising:
A reflection characterized in that a second reflective polarizing member that reflects the first polarized light and transmits the second polarized light is disposed in an outer peripheral region surrounding an image display region of the reflective liquid crystal display element. Type liquid crystal display device.   2. The reflective liquid crystal display device according to claim 1, wherein a light shielding member is disposed in a region facing the first reflective polarizing member with the second reflective polarizing member interposed therebetween.   The reflective liquid crystal display device according to claim 2, wherein the light shielding member is laminated on the second reflective polarizing member.   The said 2nd reflection type polarization member is arrange | positioned in the area | region adjacent to the said polarization member among the outer peripheral area | regions which surround the said image display area, The any one of Claims 1-3 characterized by the above-mentioned. Reflective liquid crystal display device.   5. The reflective liquid crystal display device according to claim 4, wherein the second reflective polarizing member is disposed in an entire outer peripheral region surrounding the image display region. 6.   A third reflective polarizing member that includes a housing disposed to cover the reflective liquid crystal display element, and reflects the first polarized light and transmits the second polarized light to the inner surface of the housing. The reflective liquid crystal display device according to claim 1, wherein the reflective liquid crystal display device is disposed.   The reflective liquid crystal display according to claim 6, wherein the third reflective polarizing member is disposed on a wall surface of the casing that surrounds the reflective liquid crystal display element in an inner surface of the casing. apparatus.   The housing includes a protruding portion that covers an outer peripheral region that surrounds the image display region, and the third reflective polarizing member is disposed on a surface of the protruding portion of the inner surface of the housing. The reflective liquid crystal display device according to claim 6 or 7, characterized in that:   The protruding portion of the casing is provided so as to cover an area adjacent to the polarizing member in an outer peripheral area surrounding the image display area, and the third reflective polarizing member is an inner surface of the casing, The reflective type according to claim 8, wherein the reflective type is disposed on a surface of a protruding portion of the casing provided so as to cover an area adjacent to the polarizing member in an outer peripheral area surrounding the image display area. Liquid crystal display device.

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