JP2006308745A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection type liquid crystal display device capable of achieving the observation of a picture from a wide range direction. <P>SOLUTION: The liquid crystal display device includes: a liquid crystal display panel 1; a surface light source 2 arranged to be opposed to the incident surface of the liquid crystal display panel 1; a screen member 4 arranged in front of the emitting surface of the liquid crystal display panel 1, having a transmission type screen surface 5 surrounding the periphery of the front area of the liquid crystal display panel 1, and also having an incident part 6 on which emitted light from the liquid crystal display panel 1 is made incident formed on its surface opposed to the liquid crystal display panel 1; and a direction changing means 8 having optical characteristic that the incident light is emitted after the direction of the incident light is changed to a direction radially widened to a periphery direction, provided at the previously fixed position of the path of the light emitted from the surface light source 2 and radiating the light emitted from the surface light source 2 and transmitted through the liquid crystal display panel 1 to the screen surface 5 of the screen member 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection type liquid crystal display device.

Conventionally, a projection-type liquid crystal display device has a screen region in which a plurality of pixels are arranged in a matrix, and controls the transmission of light incident from one surface by the plurality of pixels, thereby transmitting image light from the other surface. A liquid crystal display panel that emits light, a light source that emits illumination light toward an incident surface of the liquid crystal display panel, a transmissive flat screen disposed in front of the light emission surface of the liquid crystal display panel, and the liquid crystal display panel And a projection system that projects the emitted light onto the flat screen (see Patent Document 1).
JP-A-6-194619

  However, the conventional projection type liquid crystal display device projects the display image of the liquid crystal display panel onto a transmission type flat screen, and causes the projection image to be observed from the opposite side of the flat screen. Is limited.

  An object of the present invention is to provide a projection-type liquid crystal display device capable of observing images from a wide range of directions.

  The liquid crystal display device of the present invention has a screen region in which a plurality of pixels are arranged in a matrix, and controls the transmission of light incident from one surface by the plurality of pixels to emit image light from the other surface. A liquid crystal display panel, a light source disposed facing the incident surface of the liquid crystal display panel, and emitting illumination light toward the liquid crystal display panel; and disposed in front of the output surface of the liquid crystal display panel, the liquid crystal display A screen member having a transmission screen surface surrounding the periphery of a region in front of the panel, and having an incident portion for allowing light emitted from the liquid crystal display panel to be incident on a surface facing the liquid crystal display panel; The liquid crystal display panel has an optical characteristic that emits light in a direction that spreads radially in a circumferential direction, is provided at a predetermined position in a path of light emitted from the light source, and is emitted from the light source. The transmitted light is incident from the incident part of the screen member, characterized in that a deflection means for irradiating the screen surface.

  In the liquid crystal display device of the present invention, the screen member is a cylindrical screen surface having an axis that is substantially parallel to the normal line of the liquid crystal display panel and passes through the vicinity of the center of the screen area of the liquid crystal display panel. And the deflecting means is provided between the light source and the screen member, and refracts light incident from the light source side surface in a direction radially spreading in the circumferential direction, thereby the screen member side. It is desirable that the lens is made of a lens that emits light from the surface.

  In this case, the screen member has an incident portion formed on an end surface facing the liquid crystal display panel, the screen surface is formed on an outer peripheral surface, and the inner peripheral surface is refracted by a deflecting unit including the lens. It consists of a cylindrical member formed with a plurality of annular prisms that refract the light incident from the incident portion in a direction in which the angle with respect to the plane perpendicular to the axis of the cylindrical surface becomes smaller and enter the screen surface. Is preferred.

  In the liquid crystal display device of the present invention, the screen member is a spherical screen having a center on a line that is substantially parallel to a normal line of the liquid crystal display panel and passes near the center of the screen area of the liquid crystal display panel. The direction changing means is provided between the light source and the screen member or in the incident portion of the screen member, and the light incident from the surface on the light source side spreads radially in the circumferential direction. A lens that refracts the light and exits from the surface on the screen member side, or a reflection that is provided on the opposite side of the incident portion of the screen member and reflects the light incident from the incident portion in a direction radially spreading in the circumferential direction. It is desirable to have a surface.

  In the liquid crystal display device of the present invention, a light source is disposed facing the incident surface of the liquid crystal display panel, and a transmissive screen surface surrounding the periphery of the region in front of the liquid crystal display panel in front of the output surface of the liquid crystal display panel And a predetermined position of a path of light emitted from the light source, and a screen member on which an incident portion for allowing the emitted light from the liquid crystal display panel to enter is disposed on a surface facing the liquid crystal display panel. And having an optical characteristic of emitting incident light in a direction that radially spreads in a circumferential direction, and emitting light emitted from the light source and transmitted through the liquid crystal display panel from the incident portion of the screen member. By providing a turning means for irradiating the screen surface, the display image of the liquid crystal display panel is displayed on the transmission screen surface of the screen member (in front of the liquid crystal display panel). The projection image is projected from the outer peripheral direction of the screen member, that is, the peripheral direction of the front area of the liquid crystal display panel. According to this liquid crystal display device, The image can be observed from a wide range of directions.

  The liquid crystal display device of the present invention is centered on an axis that is substantially parallel to the normal line of the liquid crystal display panel and passes through the vicinity of the center of the screen area of the liquid crystal display panel, in front of the emission surface of the liquid crystal display panel. A screen member having a cylindrical screen surface is disposed, and the light incident from the light source side surface is refracted in a direction radially spreading in the circumferential direction between the light source and the screen member, and the screen member side It is desirable to have a configuration in which a turning unit composed of a lens that emits from the surface of the liquid crystal display is arranged. By doing so, an image can be observed from the entire circumference around the area in front of the liquid crystal display panel. .

  In this case, the screen member is refracted by the turning means including the lens, the incident portion is formed on the end surface facing the liquid crystal display panel, the screen surface is formed on the outer peripheral surface, and the inner peripheral surface. A cylindrical member formed with a plurality of annular prisms that refracts light incident from the incident portion in a direction in which an angle with respect to a plane perpendicular to the axis of the cylindrical surface is reduced and enters the screen surface. Preferably, by doing so, the front luminance of the image observed from the periphery of the area in front of the liquid crystal display panel can be increased.

  Further, the liquid crystal display device of the present invention is centered on a line passing through the vicinity of the center of the screen area of the liquid crystal display panel, in front of the emission surface of the liquid crystal display panel, substantially parallel to the normal line of the liquid crystal display panel. A screen member having a spherical screen surface, and a direction in which light incident from the surface on the light source side is radially spread between the light source and the screen member or at an incident portion of the screen member in a circumferential direction. Or deflecting means comprising a lens that is refracted and emitted from the surface on the screen member side, or the light incident from the incident portion is radially formed on the opposite side of the incident portion of the screen member in the circumferential direction. A configuration may be provided in which a turning means composed of a reflecting surface that reflects in the spreading direction is provided. By doing so, an image can be observed from a wider range of directions. That.

(First embodiment)
1 and 2 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of a liquid crystal display device, and FIG. 2 is a cross-sectional view in which the hatching of the liquid crystal display device is omitted.

  This liquid crystal display device has a screen region 1a in which a plurality of pixels (not shown) are arranged in a matrix, and the transmission of light incident from one surface is controlled by the plurality of pixels, and an image is displayed from the other surface. A liquid crystal display panel 1 that emits light; a light source 2 that is disposed opposite to an incident surface of the liquid crystal display panel 1 and emits illumination light toward the liquid crystal display panel 1; and an emission surface of the liquid crystal display panel 1 Is disposed in front of the liquid crystal display panel 1 and has a transmissive screen surface 5 surrounding the area in front of the liquid crystal display panel 1, and light emitted from the liquid crystal display panel 1 (image light) is provided on a surface facing the liquid crystal display panel 1. ) And an optical characteristic of emitting incident light by changing the direction in a direction radially spreading in the circumferential direction, and a path of light emitted from the light source 2 in advance. Set in the specified position Being, said emitted from the light source 2 light transmitted through the liquid crystal display panel 1, and a said screen member deflection means 8 for irradiating the screen surface 5 is made incident from the incident part 6 of 4.

  1 and 2 show the liquid crystal display panel 1 in a simplified manner, the liquid crystal display panel 1 is, for example, of an active matrix type, and has a pair of incident and output sides facing each other with a liquid crystal layer interposed therebetween. Of the transparent substrates facing each other, a plurality of transparent pixel electrodes arranged in a matrix in the row direction and the column direction on the inner surface of one substrate, and a plurality of TFTs ( Thin film transistor), a plurality of gate wirings for supplying gate signals to the TFTs in each row, and a plurality of data wirings for supplying data signals to the TFTs in each column, and the plurality of pixel electrodes on the inner surface of the other substrate Opposite single film-like transparent counter electrodes are provided, and a polarizing plate is attached to the outer surfaces of a pair of transparent substrates.

  The light source 2 is a surface light source having a light emitting surface facing the entire screen area 1a of the liquid crystal display panel 1, and the normal line (the surface of the substrate surface) of the liquid crystal display panel 1 is formed on the entire emitting surface. Condensing lenses 3 for emitting illumination light having a high intensity distribution in a direction along the normal line) are arranged at a minute pitch.

  The surface light source 2 is shown in a simplified manner in FIGS. 1 and 2. For example, the surface light source 2 emits light to one end surface of a plate-like transparent member having an area facing the entire screen area 1 a of the liquid crystal display panel 1. An incident end face to be incident is formed, an exit end face of light incident from the incident end face is formed on one of the two plate surfaces, and the light incident from the incident end face is reflected on the other end face toward the exit end face. A light guide plate having a surface formed thereon, and a plurality of solid light emitting elements such as LEDs (light emitting diodes) arranged to face the incident end face of the light guide plate and emitting light toward the incident end face, The condenser lens 3 is formed on the exit surface of the light guide plate.

  On the other hand, the screen member 4 is a cylindrical screen surface 5 centering on an axis O that is substantially parallel to the normal line of the liquid crystal display panel 1 and passes near the center of the screen region 1a of the liquid crystal display panel 1. have.

  The screen member 4 is formed of a transparent cylindrical member having an incident portion 6 formed on an end surface facing the liquid crystal display panel 1 and the screen surface 5 formed on an outer peripheral surface. A diffusion process (for example, a roughening process) for diffusing the light transmitted through the screen surface 5 is performed. Hereinafter, the screen member 4 is referred to as a cylindrical screen member.

  The diverting means 8 is provided between the surface light source 2 and the cylindrical screen member 4, and refracts light incident from the surface on the surface light source 2 side in a direction radially spreading in the circumferential direction. It consists of a lens such as a circular Fresnel lens that exits from the surface on the screen member 4 side. Hereinafter, this turning means 8 is referred to as a turning lens.

  The deflecting lens 8 has, for example, a surface opposite to the lens surface facing the surface light source 2 between the surface light source 2 and the liquid crystal display panel 1 and a center of the lens on the axis of the cylindrical screen member 4 ( It is arranged so as to substantially coincide with the axial line (O) of the cylindrical surface.

  The liquid crystal display panel 1 has a square screen region 1 a that is substantially circumscribed by the inner circumference of the cylindrical screen member 4, and the deflecting lens 8 has an inner diameter of the cylindrical screen member 4. Have substantially the same diameter.

  In this liquid crystal display device, illumination light is emitted from the surface light source 2, and image light transmitted through the screen region 1 a of the liquid crystal display panel 1 is incident on the cylindrical screen member 4 from its incident portion 6, and this cylinder The projection is projected onto the transmission screen surface 5 on the outer periphery of the screen member 4.

  That is, in this liquid crystal display device, the diverting lens 8 is disposed between the surface light source 2 and the liquid crystal display panel 1, so that the light emitted from the surface light source 2 is transmitted by the diverting lens 8. The image light emitted from the liquid crystal display panel 1 is transmitted through the screen area 1a of the liquid crystal display panel 1 after changing its direction in a direction radially spreading in the circumferential direction as indicated by an arrow in FIG. The light enters the cylindrical screen member 4 from the incident portion 6 toward the entire area of the transmissive screen surface 5 on the outer peripheral surface of the cylindrical screen member 4 and is projected onto the screen surface 5.

  Then, the image light projected on the transmission type screen surface 5 is diffused by the screen surface 5 subjected to the diffusion treatment and emitted to the outer periphery of the cylindrical screen member 4, and is observed from the outer peripheral direction of the cylindrical screen member 4. Is done.

  In this liquid crystal display device, an image to be displayed on the cylindrical screen surface 5 of the cylindrical screen member 4 is an edge opposite to the liquid crystal display panel 1 side of the screen surface 5 (FIGS. 1 and 2). A developed image developed on an annular plane with the edge on the liquid crystal display panel 1 side of the screen surface 5 (the lower edge in FIGS. 1 and 2) on the outer peripheral side is displayed on the center side.

  That is, the liquid crystal display device applies a driving voltage corresponding to the image data of the developed image to each pixel in a region corresponding to the annular plane in the square screen region 1a of the liquid crystal display panel 1. The developed image is displayed on the liquid crystal display panel 1, and the deflecting lens 8 transmits light emitted from the inner peripheral edge of the annular region of the liquid crystal display panel 1 to the liquid crystal display panel 1 side of the screen surface 5. Is incident on the opposite edge, and the light emitted from the outer peripheral edge of the annular region is incident on the edge of the screen surface 5 on the liquid crystal display panel 1 side.

  Therefore, an image projected on the transmission screen surface 5 on the outer periphery of the cylindrical screen member 4 is a display image obtained by reversely developing the developed image displayed on the liquid crystal display panel 1 on the screen surface (cylindrical surface) 5. It is.

  As described above, the liquid crystal display device has the surface light source 2 disposed so as to face the incident surface of the liquid crystal display panel 1, and is disposed in front of the emission surface of the liquid crystal display panel 1 and in front of the liquid crystal display panel 1. A screen member 4 having a transmissive screen surface 5 surrounding the area and having an incident portion 6 for allowing light emitted from the liquid crystal display panel 1 to be incident on a surface facing the liquid crystal display panel 1 is disposed. The liquid crystal display panel has an optical characteristic in which incident light is emitted at a predetermined position in a path of light emitted from the light source, changing its direction in a direction radially spreading in a circumferential direction, and emitted from the surface light source 2 The display image (development image) of the liquid crystal display panel 1 is provided by providing a deflecting lens 8 that transmits the light 1 and enters the screen member 4 through the light incident portion 6. The screen member 4 is projected onto the transmissive screen surface 5, and the projected image is observed from the outer peripheral direction of the screen member 4, that is, from the peripheral direction of the front area of the liquid crystal display panel 1. According to the display device, an image can be observed from a wide range of directions.

  In addition, the liquid crystal display device of this embodiment is located in front of the emission surface of the liquid crystal display panel 1 and substantially parallel to the normal line of the liquid crystal display panel 1 and near the center of the screen region 1a of the liquid crystal display panel 1. Is disposed between the surface light source 2 and the screen member 4 (in this embodiment, the surface light source 2 and the liquid crystal display panel 1). Between the surface light source 2 side and the diverting lens 8 that refracts the light incident in the circumferential direction in a radially expanding direction and emits the light from the surface on the screen member 4 side. The image can be observed from the entire circumferential direction around the area in front of the liquid crystal display panel 1, that is, from the angular direction of 360 degrees around the area in front of the liquid crystal display panel 1.

  In this embodiment, the screen member 4 is a cylindrical member. However, the screen member 4 has a transmission type in which an incident portion is formed on an end surface facing the liquid crystal display panel 1 and is diffused on the outer peripheral surface. A transparent cylindrical member having a screen surface may be used.

(Second Embodiment)
3 and 4 show a second embodiment of the present invention. FIG. 3 is an exploded perspective view of the liquid crystal display device, and FIG. 4 is a cross-sectional view in which the hatching of the liquid crystal display device is omitted. In this embodiment, components corresponding to those of the first embodiment are denoted by the same reference numerals, and description of the same components is omitted.

  In the liquid crystal display device of this embodiment, the cylindrical screen is refracted by the deflecting lens 8 on the inner peripheral surface of the cylindrical screen member 4 made of a transparent cylindrical member arranged in front of the emission surface of the liquid crystal display panel 1. A plurality of light beams that enter the member 4 from the incident portion 6 are refracted in a direction in which an angle with respect to a surface perpendicular to the axis O of the cylindrical screen member is reduced and are incident on the transmissive screen surface 5 on the outer peripheral surface. The annular prism 7 is formed at a dense pitch, and the other configuration is the same as that of the liquid crystal display device of the first embodiment.

  In this liquid crystal display device, an incident portion 6 is formed on an end surface facing the liquid crystal display panel 1 in front of an emission surface of the liquid crystal display panel 1, and a transmissive screen surface 5 subjected to diffusion treatment is formed on an outer peripheral surface. Since the cylindrical screen member 4 having the plurality of annular prisms 7 formed on the inner peripheral surface is disposed, the light refracted by the deflecting lens 8 and incident on the screen member 4 from the incident portion 6 is transmitted. The plurality of annular prisms 7 on the inner peripheral surface of the screen member 4 are refracted in a direction in which an angle with respect to a plane perpendicular to the axis O of the cylindrical surface is reduced as indicated by an arrow in FIG. It can be incident on the screen surface 5 of the outer peripheral surface of the screen member 4, and is therefore observed from the periphery of the area in front of the liquid crystal display panel 1, that is, from the outer peripheral direction of the cylindrical screen member 4. It can be increased (luminance as viewed from the direction of the vicinity of a plane normal to the axis O of the cylindrical screen member 4) front luminance of the image.

(Third embodiment)
5 and 6 show a third embodiment of the present invention. FIG. 5 is an exploded perspective view of the liquid crystal display device, and FIG. 6 is a cross-sectional view in which the hatching of the liquid crystal display device is omitted.

  In the liquid crystal display device of this embodiment, a surface light source 10 that emits illumination light toward the liquid crystal display panel 9 is disposed so as to oppose the incident surface of the liquid crystal display panel 9. The liquid crystal display has a spherical screen surface 12 having a center on a line that is substantially parallel to the normal line of the liquid crystal display panel 9 and passes through the vicinity of the center of the screen region 9a of the liquid crystal display panel 9, A screen member 11 having an incident portion 13 for allowing light emitted from the liquid crystal display panel 9 to enter is disposed on a surface facing the panel 9, and between the surface light source 10 and the screen member 11, for example, a surface light source 10 and the liquid crystal display panel 9 have an optical characteristic that emits incident light in a direction that spreads radially in the circumferential direction, and is emitted from the surface light source 10 and has a screen area of the liquid crystal display panel 9. The light transmitted through the 9a, in which the said entrance portion 13 deflection means 14 is made incident is irradiated on the spherical screen surface 12 of the screen member 11 was provided.

  The screen member 11 is made of a transparent hollow spherical member, and a spherical screen surface 12 subjected to diffusion treatment (for example, roughening treatment) is formed on the outer peripheral surface thereof. An incident portion 13 made of a circular hole is formed on the opposing surface. Hereinafter, the screen member 11 is referred to as a spherical screen member.

  5 and 6 show the liquid crystal display panel 9 and the surface light source 10 in a simplified manner, the liquid crystal display panel 9 is, for example, an active having the same configuration as the liquid crystal display panel 1 of the first embodiment. It is a matrix liquid crystal display panel, and has a square screen region 9 a having an area corresponding to the incident portion 13 of the spherical screen member 11.

  Similarly to the surface light source 2 of the first embodiment, the surface light source 10 faces the light guide plate having an area facing the entire screen region 9a of the liquid crystal display panel 9 and the incident end surface of the light guide plate. Although not shown in the figure, the emission surface of the light guide plate has a high intensity of emitted light in a direction along the normal line of the liquid crystal display panel 9. Condensing lenses for emitting illumination light having an intensity distribution are arranged at a minute pitch.

  Further, the direction changing means 14 is composed of a lens such as a circular Fresnel lens that refracts the light incident from the surface on the surface light source 10 side in a radially expanding direction and emits the light from the surface on the screen member 11 side. ing. Hereinafter, this turning means 14 is referred to as a turning lens.

  In this liquid crystal display device, the light emitted from the surface light source 2 is spread radially by the deflecting lens 14 in the circumferential direction as indicated by the arrow in FIG. 6 and is incident on the liquid crystal display panel 9. The image light transmitted through the screen region 9a of the panel 9 is incident on the spherical screen member 11 from the incident portion 13 toward the transmissive screen surface 12 on the outer peripheral surface of the spherical screen member 11, and the screen. The projected image is projected onto the surface 12 and the projected image is observed from the peripheral direction of the spherical screen member 11.

  In the liquid crystal display device of this embodiment, of the transmissive screen surface 12 on the outer periphery of the spherical screen member 11, the equator portion (the center of the spherical screen member 11 is substantially parallel to the normal line of the liquid crystal display panel 9). The image is projected on the substantially hemispherical portion on the opposite side of the liquid crystal display panel 9 from the vicinity of the circumferential portion along the plane passing through the screen, and is displayed on the hemispherical portion of the screen surface 12. A developed image in which the image is developed on a circular plane having the top of the hemispherical portion (the side opposite to the incident portion 13 of the spherical screen member 11) as the center side and the equator portion side as the outer peripheral side is displayed on the liquid crystal display panel 9. To display.

  That is, in this embodiment, a drive voltage corresponding to the image data of the developed image is applied to each pixel in a region corresponding to the circular plane in the screen region 9a of the liquid crystal display panel 9, and the developed image is displayed. Displayed on the liquid crystal display panel 9, the diverting lens 8 causes the light emitted from the center of the circular area of the liquid crystal display panel 9 to enter the top of the hemispherical portion of the screen surface 12, and The light emitted from the outer peripheral edge of the region is designed to enter the vicinity of the equator of the screen surface 12.

  This liquid crystal display device is centered on a line in front of the emission surface of the liquid crystal display panel 9 and substantially parallel to the normal line of the liquid crystal display panel 9 and passing through the vicinity of the center of the screen region 9a of the liquid crystal display panel 9. A spherical screen member 11 having a spherical screen surface 12 having the following is disposed between the surface light source 10 and the screen member 11 (in this embodiment, between the surface light source 10 and the liquid crystal display panel 9). The liquid crystal display panel 9 is provided with a deflecting lens 14 that refracts light incident from the surface on the surface light source 10 side in a radial direction and emits the light from the surface on the spherical screen member 11 side. Is projected onto the substantially hemispherical portion of the screen surface 12 of the spherical screen member 11 so that the image can be observed from a wider range than in the first embodiment. It is possible.

  In this embodiment, the spherical screen member 11 is a hollow spherical member. However, the screen member 11 has a planar incident portion formed on the end surface facing the liquid crystal display panel 9 and a diffusion treatment on the outer peripheral surface. A transparent solid spherical member on which the transmissive screen surface is formed may be used.

(Fourth embodiment)
FIG. 7 is a cross-sectional view of the liquid crystal display device according to the fourth embodiment of the present invention in which hatching is omitted. In this embodiment, the same reference numerals are given to those corresponding to the third embodiment, and the description of the same components is omitted.

  This liquid crystal display device includes a spherical screen member 11a made of a transparent solid spherical member. In this embodiment, the incident portion provided on the surface of the spherical screen member 11a facing the liquid crystal display panel 9 is provided. A diverter lens 15 that is recessed into the inner spherical surface of the screen member 11a is formed on 13a, and the diverter lens 14 provided between the surface light source 10 and the screen member 11 is omitted in the third embodiment. .

  In the liquid crystal display device of this embodiment, the light incident on the spherical screen member 11a from the incident portion 13a is emitted from the surface light source 2 and transmitted through the screen region 9a of the liquid crystal display panel 9 is provided in the incident portion 13a. As shown by the arrow in FIG. 7, the deflecting lens 15 is radially spread in the circumferential direction and projected onto the transmissive screen surface 12a on which the outer peripheral surface of the spherical screen member 11a has been subjected to diffusion processing. Is.

  In this liquid crystal display device, since the diverting lens 15 that is recessed in a spherical shape inside the screen member 11a is provided in the incident portion 13a of the spherical screen member 11a, the spherical screen member 11a is incident from the incident portion 13a. The deflected light can be spread radially in the circumferential direction by the deflecting lens 15 and can be incident on substantially the entire area of the transmissive screen surface 12a on the outer peripheral surface of the spherical screen member 11a.

  Therefore, according to the liquid crystal display device, the spherical screen surface 12a of the spherical screen member 11a in the screen area 9a of the liquid crystal display panel 9 is opposite to the liquid crystal display panel 9 side of the screen surface 12a (spherical screen). A circular region corresponding to a circular plane centered on the top of the member 11a opposite to the incident portion 13a) and having the liquid crystal display panel 9 side of the screen surface 12a (the incident portion 13a side of the spherical screen member 11a) as the outer peripheral side. Then, a developed image obtained by developing the image to be displayed on the spherical screen surface 12a on the circular plane is displayed, and the developed image is incident on substantially the entire area of the transmissive screen surface 12a on the outer peripheral surface of the spherical screen member 11a. Therefore, the image can be observed from a wider range of directions than the liquid crystal display device of the third embodiment. Can. In this embodiment, the spherical screen member 11a is a solid spherical member. However, the screen member 11a may be a hollow spherical member, or a hollow liquid filled with a transparent liquid or the like.

(Fifth embodiment)
8 and 9 show a fifth embodiment of the present invention. FIG. 8 is an exploded perspective view of the liquid crystal display device, and FIG. 9 is a cross-sectional view in which the hatching of the liquid crystal display device is omitted. In this embodiment, the same reference numerals are given to those corresponding to the third embodiment, and the description of the same components is omitted.

  In the liquid crystal display device of this embodiment, the spherical screen member 11 of the third embodiment protrudes in a spherical shape on the inner side of the screen member 11a on the side opposite to the incident portion 13, and the spherical screen extends from the incident portion 13. A direction reflecting surface 18 that reflects light incident on the member 11 in a direction radially spreading in the circumferential direction is provided, and the direction changing lens 14 provided between the surface light source 10 and the screen member 11 in the third embodiment is provided. It is omitted.

  In this embodiment, a circular hole 16 is provided on the opposite side of the spherical screen member 11 from the incident portion 13a, and a plug member in which the deflecting reflection surface 18 is formed is fitted into the circular hole 16. Yes.

  That is, the liquid crystal display device emits light from the surface light source 2, passes through the screen region 1 a of the liquid crystal display panel 9, and enters the spherical screen member 11 from the incident portion 13. The direction-reflecting surface 18 provided on the side opposite to the incident portion 13a is spread radially in the circumferential direction as shown by the arrow in FIG. 9 and is formed on the transmission screen surface 12 on the outer peripheral surface of the spherical screen member 11a. Projected.

  In this liquid crystal display device, the spherical screen surface 12 of the spherical screen member 11 in the screen region 9a of the liquid crystal display panel 9 is placed on the liquid crystal display panel 9 side of the screen surface 12 (incidence of the spherical screen member 11). A circular region developed in a circular plane with the screen surface 12 on the opposite side of the screen surface 12 from the liquid crystal display panel 1 side (the side opposite to the incident portion 13 of the spherical screen member 11) as the outer peripheral side. A developed image obtained by developing the image to be displayed on the screen surface 12 on the circular plane is displayed.

  Since this liquid crystal display device is provided with a turning reflection surface 18 projecting spherically on the inside of the screen member 11 on the side opposite to the incident portion 13 of the spherical screen member 11, the spherical screen member 11a has The light incident from the incident portion 13a can be spread radially in the circumferential direction by the deflecting reflection surface 18 and can be incident on substantially the entire area of the transmissive screen surface 12 on the outer peripheral surface of the spherical screen member 11. Images can be observed from a wider range of directions than the liquid crystal display device of the third embodiment.

(Other embodiments)
In the first to third embodiments, the diverting lenses 8 and 14 are provided between the surface light sources 2 and 10 and the liquid crystal display panels 1 and 9, but the diverting lenses 8 and 14 are It may be provided between the liquid crystal display panels 1 and 9 and the screen members 4 and 11.

  The liquid crystal display devices of the first and second embodiments are provided with a cylindrical screen member 4 having a cylindrical screen surface 5, and the liquid crystals of the third to fifth embodiments. The display device includes spherical screen members 11 and 11a having spherical screen surfaces 12 and 12a, but the screen member disposed in front of the exit surface of the liquid crystal display panels 1 and 9 has a polygonal cylindrical surface shape. It may be a cylindrical screen member having a screen surface or a spherical screen member having a polygonal spherical screen surface.

  Further, in the liquid crystal display devices of the first to fifth embodiments, the surface light sources 2 and 10 are arranged so as to face the incident surfaces of the liquid crystal display panels 1 and 9, but the liquid crystal display panels 1 and 9 The light source disposed to face the incident surface may be a light source lamp and a reflector that reflects the emitted light from the light source lamp toward the liquid crystal display panels 1 and 9.

1 is an exploded perspective view of a liquid crystal display device showing a first embodiment of the present invention. Sectional drawing which abbreviate | omitted hatching of the liquid crystal display device of a 1st Example. The disassembled perspective view of the liquid crystal display device which shows 2nd Example of this invention. Sectional drawing which abbreviate | omitted hatching of the liquid crystal display device of a 2nd Example. The disassembled perspective view of the liquid crystal display device which shows the 3rd Example of this invention. Sectional drawing which abbreviate | omitted hatching of the liquid crystal display device of the 3rd Example. Sectional drawing which abbreviate | omitted hatching of the liquid crystal display device which shows 4th Example of this invention. The disassembled perspective view of the liquid crystal display device which shows the 5th Example of this invention. Sectional drawing which abbreviate | omitted hatching of the liquid crystal display device of the 5th Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,9 ... Liquid crystal display panel, 1a, 9a ... Screen area | region, 2,10 ... Surface light source, 4, 11, 11a ... Screen member, 5, 12, 12a ... Transmission type screen surface, 6, 13, 13a ... Incident part , 7... An annular prism, 8, 14, 15.

Claims (4)

A liquid crystal display panel having a screen region in which a plurality of pixels are arranged in a matrix, and controlling the transmission of light incident from one surface by the plurality of pixels to emit image light from the other surface;
A light source disposed facing the incident surface of the liquid crystal display panel and emitting illumination light toward the liquid crystal display panel;
The liquid crystal display panel has a transmissive screen surface disposed in front of the light emission surface of the liquid crystal display panel and surrounding a region in front of the liquid crystal display panel, and light emitted from the liquid crystal display panel on a surface facing the liquid crystal display panel. A screen member on which an incident part for making the light incident is formed;
It has an optical characteristic of emitting incident light in a direction that spreads radially in the circumferential direction, is provided at a predetermined position in the path of light emitted from the light source, and emits the liquid crystal display panel from the light source. A liquid crystal display device comprising: a direction changing unit configured to cause the transmitted light to be incident from the incident portion of the screen member and irradiate the screen surface.   The screen member has a cylindrical screen surface that is substantially parallel to the normal line of the liquid crystal display panel and has an axis passing through the vicinity of the center of the screen area of the liquid crystal display panel, and the direction changing means is The lens is provided between the light source and the screen member, and refracts the light incident from the light source side surface in a direction radially spreading in the circumferential direction and emits the light from the screen member side surface. The liquid crystal display device according to claim 1.   The screen member has an incident portion formed on an end surface facing the liquid crystal display panel, a screen surface is formed on an outer peripheral surface, and light incident on the inner peripheral surface is refracted by a diverting unit including a lens and incident from the incident portion. 3. A cylindrical member formed with a plurality of annular prisms that are refracted in a direction in which an angle with respect to a plane perpendicular to the axis of the cylindrical surface is reduced and is incident on the screen surface. A liquid crystal display device according to 1.   The screen member has a spherical screen surface that is substantially parallel to the normal line of the liquid crystal display panel and has a center on a line passing through the vicinity of the center of the screen area of the liquid crystal display panel. A lens that is provided between the light source and the screen member or at an incident portion of the screen member, and refracts light incident from the light source side surface in a direction radially spreading in the circumferential direction and emits the light from the screen member side surface. Alternatively, the screen member is provided on a side opposite to the incident portion of the screen member, and includes a reflection surface that reflects light incident from the incident portion in a direction radially spreading in the circumferential direction. The liquid crystal display device described.

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