JP2014115531A - Stereoscopic video picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic video picture display device that can prevent reduction in image quality without using a whole area black image in a transmission type liquid crystal display panel.SOLUTION: The stereoscopic video picture display device is configured to include: an optical member 12 that causes light emitted from a right light source and passing through a transmission type liquid crystal display panel and light emitted from a left light source and passing through the transmission type liquid crystal display panel to be separated and guided to a right-eye area and a left-eye area; time-division video picture write-in control means 20 that consecutively and alternately changes and writes right-eye video picture information and left-eye video picture information in the transmission type liquid crystal display panel; and first light source control means 20 that causes the right light source and the left light source to be lighted off for a period of changing the right-eye video picture information and the left-eye video picture information, causes the left light source to be lighted on at a timing when write-in of the left-eye video picture information is completed, causes the right light source and the left light source to be lighted off for a period of changing, and causes the right light source to be lighted on at a timing when write-in of the right-eye video picture information is completed.

Description

  The present invention relates to a stereoscopic video display apparatus that provides a video that allows a user to view a stereoscopic video without using special glasses such as shutter glasses or polarized glasses.

  Conventionally, a stereoscopic video display device described in Patent Document 1 is known. The optical system of this stereoscopic image display apparatus is basically configured as shown in FIG. In FIG. 7, the right light source 110R and the left light source 110L are arranged in the horizontal direction behind the transmissive liquid crystal display panel 100 (transmissive image display panel) with a center line Lc passing through the center of the transmissive liquid crystal display panel 100 as a boundary. They are arranged side by side. Further, a convex lens plate 120 is disposed between the right light source 110R and the left light source 110L and the transmissive liquid crystal display panel 100. In such a stereoscopic image display device, the convex lens plate 120 causes the light R emitted from the right light source 110R to pass through the transmissive liquid crystal display panel 100, and the light L emitted from the left light source 110L to pass through the transmissive liquid crystal display panel 100. Are separated into a right eye region and a left eye region, which are divided and arranged in the horizontal direction. Thereby, in the right eye region (R), an image formed on the transmissive liquid crystal display panel 100 can be viewed using the light R from the right light source 110R as a backlight, but the light L from the left light source 110L is used as a backlight. As a result, an image formed on the transmissive liquid crystal display panel 100 cannot be seen. On the contrary, in the left eye region (L), an image formed on the transmissive liquid crystal display panel 100 can be viewed using the light L from the left light source 110L as a backlight, but the light R from the right light source 110R can be viewed. As a backlight, an image formed on the transmissive liquid crystal display panel 100 cannot be seen.

  Then, the transmissive liquid crystal display panel 100 displays a right-eye image (right-eye field image) and a left-eye image (left-field image) at high speed and displays the right light source 110R and the left light source so as to correspond thereto. 110L is alternately switched between a lighting state and a light-off state at high speed. Accordingly, the transmissive liquid crystal display panel 100 is directly opposed to the transmissive liquid crystal display panel 100 at a position within a predetermined distance range from the transmissive liquid crystal display panel 100 so that the right eye ER is located in the right eye region and the left eye EL is located in the left eye region. The user can alternately view only the right-eye image with the right eye ER and only the left-eye image with the left eye EL in a predetermined cycle. Therefore, the user can recognize a stereoscopic image from a right-eye image viewed with the right eye ER and a left-eye image viewed with the left eye EL without using special glasses.

  By the way, in the transmissive liquid crystal display panel 100, all elements (pixels) arranged two-dimensionally based on video information are not driven at once, but each element is driven sequentially (writing video information). Therefore, it takes a certain amount of time to rewrite the image on the entire surface of the transmissive liquid crystal display panel 100. For this reason, in the conventional stereoscopic video display device described above, the right-eye video and the left-eye video are partially displayed simultaneously when switching between the right-eye video and the left-eye video on the transmissive liquid crystal display panel 100. (Mixed), the image quality of the stereoscopic video that can be recognized is degraded.

  Therefore, in the transmissive liquid crystal display panel 100, the right-eye video can be rewritten to the full-black image and then rewritten to the left-eye video, and the left-eye video can be rewritten to the full-black image and then rewritten to the right-eye video. It has been proposed (see Patent Document 1). In this case, in the transmissive liquid crystal display panel 100, when the video for the right eye is switched to the video for the left eye, the video for the left eye is written after the video for the right eye is completely erased (entire black image), When the video for the left eye is switched to the video for the right eye, the video for the right eye is written after the video for the left eye is completely erased (entire black image). Thereby, it is possible to prevent image quality deterioration due to partial mixing of the right-eye video and the left-eye video when switching between the right-eye video and the left-eye video on the transmissive liquid crystal display panel 100. it can.

Japanese Patent No. 3569522

  However, as described above, in the technique of switching from one image of the right eye image and the left eye image to the entire black image in the transmissive liquid crystal display panel 100 and then switching to the other image, the amount of insertion of the entire black image is sufficient. The display cycle of each of the right-eye video and the left-eye video becomes long. For this reason, there is a possibility that flickering occurs, and the flickering causes deterioration of the image quality of the stereoscopic video.

  The present invention has been made in view of such circumstances, and provides a stereoscopic video display device capable of preventing a reduction in image quality without using a full black image in a transmissive liquid crystal display panel.

  A stereoscopic image display device according to the present invention includes a transmissive liquid crystal display panel, a right light source and a left light source arranged in a horizontal direction behind the transmissive liquid crystal display panel, the transmissive liquid crystal display panel, and the right A right eye that is disposed between a light source and a left light source and emits light from the right light source and passes through the transmissive liquid crystal display panel; and light emitted from the left light source and passes through the transmissive liquid crystal display panel. An optical member for separating and directing into a region and a left eye region, and time-division video writing control means for alternately and alternately writing video information for the right eye and video information for the left eye on the transmissive liquid crystal display panel And turning off the right light source and the left light source during a switching period from the right-eye video information to the left-eye video information in the transmissive liquid crystal display panel, and the transmissive liquid crystal display of the left-eye video information. Writing to the panel The left light source is turned on based on the timing when the image is completed, and the right light source and the left light source are turned off in the switching period from the left-eye video information to the right-eye video information in the transmissive liquid crystal display panel, And a first light source control unit that turns on the right light source based on a timing when writing of the right-eye video information to the transmissive liquid crystal display panel is completed.

  With such a configuration, the right-eye video information and the left-eye video information are sequentially and alternately switched and written in the transmissive liquid crystal display panel, and the right-eye video information is changed to the left-eye video information. Both the right light source and the left light source are turned off in each of the switching period and the switching period from the left-eye video information to the right-eye video information. For this reason, in the switching period between the video information for the right eye and the video information for the left eye, the video information for the right eye and the video information for the left eye are partially mixed in the transmissive liquid crystal display panel. However, the video based on the mixed video information is not visible to the user.

  Also, the left light source is turned on based on the timing when the left-eye video information is written to the transmissive liquid crystal display panel, and based on the timing when the right-eye video information is written to the transmissive liquid crystal display panel. Since the right light source is turned on, the user forms an image formed on the transmissive liquid crystal display panel based on the left-eye video information with the left eye and on the transmissive liquid crystal display panel based on the right-eye video information. You can be sure to see the video to be viewed with the right eye.

  The stereoscopic image display device according to the present invention may have a configuration including a first diffusion member that diffuses light transmitted through the transmissive liquid crystal display panel substantially only in the vertical direction.

  With such a configuration, the light emitted from the right light source and traveling toward the right eye region through the optical member and the transmissive liquid crystal display panel, and the optical member and the transmissive liquid crystal display panel emitted from the left light source Light traveling through the left eye region is diffused substantially only in the longitudinal direction by the first diffusing member. Thus, the user facing the transmissive liquid crystal display panel at a position within a predetermined distance range from the transmissive liquid crystal display panel so that the right eye is located in the right eye region and the left eye is located in the left eye region, Even if the viewpoints (positions of the right eye and the left eye) are moved to some extent in the vertical direction (up and down), the right eye image can be reliably viewed by the right eye and the left eye image can be reliably viewed by the left eye.

  Note that “diffuse the light transmitted through the transmissive liquid crystal display panel substantially only in the vertical direction” means that there is no diffusion in a direction other than the vertical direction and there is only diffusion in the vertical direction. This includes cases where the degree of diffusion in the direction is much greater than the degree of diffusion in other directions such as the lateral direction.

  The stereoscopic image display device according to the present invention may include a second diffusion member that diffuses light from the right light source and the left light source.

  Since the light from the right light source and the left light source is diffused by such a configuration, each of the right light source and the left light source is configured by using a plurality of point light sources or minute light sources (for example, LEDs) close thereto. Even so, the user can see a brighter image on the entire left and right eyes.

  Further, in the stereoscopic image display device according to the present invention, the right light source is provided following the right main light source arranged in parallel to the transmissive liquid crystal display panel, and the outer side from the end of the right main light source, A left auxiliary light source disposed in parallel to the transmissive liquid crystal display panel, and an outer side from an end of the left main light source. And a left auxiliary light source disposed to be inclined toward the optical member side.

  With such a configuration, the light emitted from the right main light source travels to the right eye region by the optical member, and the light emitted from the right auxiliary light source can travel to the right eye region through the periphery of the optical member. The user can see a brighter right-eye video image even in the peripheral area of. In addition, the light emitted from the left main light source travels to the left eye region by the optical member, and the light emitted from the left auxiliary light source can travel to the left eye region through the peripheral portion of the optical member. Even in this case, the user can see a brighter left-eye image.

  Furthermore, in the stereoscopic video display device according to the present invention, instead of the display switching between the right-eye video information and the left-eye video information on the transmissive liquid crystal display panel, flat video information is converted to the transmissive liquid crystal display panel. A plane image writing control means for continuously rewriting the frame unit, and the right light source and the left light source are turned off during the period in which the frame unit plane image information is being rewritten in the transmissive liquid crystal display panel. The second light source control means for turning on the right light source and the left light source based on the completion timing of rewriting can be adopted.

  With such a configuration, both the right light source and the left light source are turned off during the rewriting period of the flat image information in the frame unit in the process in which the flat image information is continuously rewritten in the frame unit in the transmissive liquid crystal display panel. . For this reason, even if the plane image information of the front and rear frames is partially mixed in the transmissive liquid crystal display panel, the image based on the mixed image information is not visible to the user. Moreover, since both the right light source and the left light source are turned on based on the timing when writing of the flat image information to the transmissive liquid crystal display panel is completed, the user can turn on the transmissive liquid crystal display panel based on the flat image information. The formed image can be reliably viewed with both the right eye and the left eye. That is, the user can surely view a planar image instead of the stereoscopic image with the stereoscopic image display device. That is, the user can view both a stereoscopic image and a planar image on the same display device.

  Further, in the stereoscopic image display device according to the present invention, the second light source control means includes the front right light source and the right light source with a light quantity smaller than the light quantity when each of the right light source and the left light source is turned on by the first light source control means. The left light source can be configured to emit light.

  With such a configuration, the brightness of a planar image that can be visually recognized by light emitted from both the right light source and the left light source can be recognized as a stereoscopic image that can be recognized by light emitted from either the right light source or the left light source (right The brightness of the eye image and the left eye image).

  In particular, the second light source control unit causes the right light source and the left light source to emit light with a light amount that is half of the light amount when the right light source and the left light source are turned on by the first light source control unit. Can do.

  According to the stereoscopic video display device according to the present invention, the right-eye display can be used in the transmissive liquid crystal display panel in the switching period between the right-eye video information and the left-eye video information without inserting the entire black image. The video based on the video information in which the video information and the left-eye video information are mixed is not visible to the user, and the user is based on the left-eye video information formed on the transmissive liquid crystal display panel. The video can be reliably viewed with the left eye, and the video based on the video information for the right eye formed on the transmissive liquid crystal display panel can be reliably viewed with the right eye. For this reason, it is possible to prevent the deterioration of the image quality of the stereoscopic video that can be visually recognized by the user without using the entire black image on the transmissive liquid crystal display panel.

It is a figure which shows the structure seen from the upper direction of the optical system of the stereo image display apparatus which concerns on one Embodiment of this invention. It is a figure which shows the structure seen from the side of the optical system of the stereo image display apparatus which concerns on embodiment of this invention. It is a figure which shows the structural example of a light source unit. It is a block diagram which shows the structure of the processing system of the stereoscopic video display apparatus which concerns on one Embodiment of this invention. Timing of writing video information for the right eye (R video writing) and writing of video information for the left eye (L video writing) in the transmissive liquid crystal display panel, and timing of turning on / off the right LED light source and the left LED light source It is a timing chart which shows. It is a figure which shows the other structural example of a light source unit. It is a timing chart which shows the timing of writing planar image information and the timing of turning on / off the right LED light source and the left LED light source when displaying a planar image. It is a figure which shows the structural example of the optical system of the conventional stereoscopic video display apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The optical system of the stereoscopic video display apparatus according to the embodiment of the present invention is configured as shown in FIGS. 1A and 1B. 1A shows the configuration viewed from above the optical system of the stereoscopic video display device, and FIG. 1B shows the configuration viewed from the side of the optical system of the stereoscopic video display device.

  1A and 1B, in this stereoscopic image display device, a light source unit 11 is disposed at a predetermined position behind the transmissive liquid crystal display panel 10 and is disposed at a predetermined position between the transmissive liquid crystal display panel 10 and the light source unit 11. A convex lens plate 12 (optical member: for example, Fresnel lens plate) is disposed. Further, at a predetermined position in front of the transmissive liquid crystal display panel 10, a vertical diffusion plate (first diffusion member: for example, a wrench killer) that diffuses incident light substantially only in the vertical direction (direction V in FIG. 1B). (Lens, ground glass, etc.) 13 is disposed. Further, a diffusing plate (second diffusing member: for example, ground glass, hologram lens, aspheric lens, or the like) 14 that diffuses incident light in various directions is disposed facing the front surface of the light source unit 11. Note that the longitudinal diffusion plate 13 can be omitted by using a linear Fresnel lens that does not collect light in the longitudinal direction for the convex lens 12.

  The light source unit 11 includes a right LED light source 11R and a left LED light source 11L. The right LED light source 11R and the left LED light source 11L are arranged side by side in the horizontal direction H so as to be joined at the ends. The boundary between the right LED light source 11R and the left LED light source 11L coincides with a center line Lc passing through the centers of the transmissive liquid crystal display panel 10, the convex lens plate 12, and the vertical diffusion plate 13. For example, as shown in FIG. 2, the light source unit 11 has a structure in which a plurality of (many) LEDs (light emitting diodes) are arranged in two rows. Then, the LED row is divided into two parts in the horizontal direction, one part being used as the right LED light source 11R and the other part being used as the left LED light source 11L. Thus, even if each of the right LED light source 11R and the left LED light source 11L is composed of a plurality of (many) LEDs close to a point light source, the light emitted from each LED passes through the diffusion plate 14, The light from the LED does not reach the convex lens plate 12 as a spot, but reaches the entire convex lens plate 12 with a spread, and the user can recognize the light as spot light of the LED and the entire screen has uniform brightness. Can be seen in

  In the optical system having such a configuration, the convex lens plate 12 emits light from the right LED light source 11R and is diffused by the diffusion plate 14, passes through the transmissive liquid crystal display panel 100 and the vertical diffusion plate 13, and the left LED light source 11L. And the light passing through the transmissive liquid crystal display panel 10 and the vertical diffusion plate 13 are separated from the center line Lc in the same manner as in the case of a conventional stereoscopic image device (see FIG. 7). The left eye region and the left eye region are separated and arranged in the horizontal direction (right and left). Thereby, in the right eye region, an image formed on the transmissive liquid crystal display panel 10 can be seen using the light R from the right LED light source 11R as a backlight, but the light L from the left LED light source 11L is used as a backlight. Cannot view images formed on the transmissive liquid crystal display panel 10. On the other hand, in the left eye region, an image formed on the transmissive liquid crystal display panel 10 can be seen using the light L from the left LED light source 11L as a backlight, but the light R from the right LED light source 11R is used as a backlight. The image formed on the transmissive liquid crystal display panel 10 cannot be seen.

  The processing system of the stereoscopic image display apparatus having the optical system as described above is configured as shown in FIG.

  In FIG. 3, the storage unit 22 stores right-eye video information (video information representing a right-eye visual field) and left-eye video information (video information representing a left-eye visual field) for providing a stereoscopic video. Are stored as one set, and plane image information representing a normal plane (two-dimensional) image is stored. The controller 20 controls the drive circuit 21 that drives the transmissive liquid crystal display panel 10 based on the video information read from the storage unit 22. The drive circuit 21 sequentially drives each element of the transmissive liquid crystal display panel 10 under the control of the controller 20 to write the video information to the transmissive liquid crystal display panel 10. Thereby, an image based on the image information is formed on the transmissive liquid crystal display panel 10.

  The controller 20 further controls the drive circuit 23R that drives the right LED light source 11R and the drive circuit 23L that drives the left LED light source 11L in synchronization with the writing of video information to the transmissive liquid crystal display panel 10. The drive circuit 23R turns on (emits light) and turns off the right LED light source 11R according to the control of the controller 20. The drive circuit 23L turns on (emits light) and turns off the left LED light source 11L according to the control of the controller 20.

  When this stereoscopic video display device provides a stereoscopic video, the controller 20 reads a set of video information for the right eye and video information for the left eye from the storage unit 22, and controls the controller 20 (time-division video writing control means, And the first light source control means) on the transmissive liquid crystal display panel 10 with the right-eye video (R video) information and the left-eye video (L video) information alternately alternately at the timing shown in FIG. Switching is written, and the right LED light source 11R and the left LED light source 11L are alternately turned off (light emission) and turned off alternately.

Referring to FIG. 4, in the process in which the right-eye video (R video) information and the left-eye video (L video) information are successively switched and written in the transmissive liquid crystal display panel 10, the writing has already been performed. In the switching period TR _{→ L} (for example, time t3 to time t4) from the right-eye video information to the left-eye video information, both the right LED light source 11R and the left LED light source 11L are turned off. . Then, based on the timing at which writing of the left-eye video information switched from the right-eye video information in the transmissive liquid crystal display panel 10 is completed (for example, time t4), specifically, the left-eye video information. The left LED light source 11L lights up (emits light) immediately after the completion of the writing.

The state in which the left-eye video information is written on the transmissive liquid crystal display panel 10 and held with the characteristics of the liquid crystal is maintained for a period T _L (for example, from time t4 to time t5). The left LED light source 11L, which has been turned on until then, immediately before the start timing of switching to video information (for example, time t5) is turned off. Thereafter, in the switching period T _{L → R} (for example, from time t5 to time t6) from the left-eye video information to the right-eye video information, both the right LED light source 11R and the left LED light source 11L are turned off. . Then, based on the timing at which the writing of the right-eye video information switched from the left-eye video information is completed (for example, time 6), specifically, the timing at which the writing of the right-eye video information is completed. Immediately after that, the right LED light source 11R is lit (emitted).

The state in which the right-eye video information is written on the transmissive liquid crystal display panel 10 and held with the characteristics of the liquid crystal is maintained for a period T _R (eg, time t6 to time t7). The right LED light source 11R, which has been turned on until then, immediately before the start timing (for example, time t7) of switching to the video information is turned off. Thereafter, similarly, in the process in which the right-eye video (R video) information and the left-eye video (L video) information are sequentially switched and written on the transmissive liquid crystal display panel 10, the right LED light source 11R is written. And the lighting and extinguishing of each of the left LED light source 11L are repeated alternately.

As shown in FIG. 1A (FIG. 1B), the user U of the stereoscopic image display apparatus operating as described above (see FIG. 4) has the right eye ER located in the right eye region and the left eye EL in the left eye region. The screen of the transmissive liquid crystal display panel 10 is viewed through the vertical diffusion plate 13 from a position within a predetermined distance range in front of the transmissive liquid crystal display panel 10. The user U then turns on the right LED in the lit state during the period T _R (time t2 to time t3, time t6 to time t7) in which the right-eye video information is written and held in the transmissive liquid crystal display panel 10. The right eye image formed by the right eye image information held in the transmissive liquid crystal display panel 10 with the light from the light source 11R as a backlight is viewed only by the right eye ER. In addition, the user U receives light from the left LED light source 11L in the lit state during a period T _L (time t4 to time t5) in which the left-eye video information is written and held in the transmissive liquid crystal display panel 10. The left-eye video formed by the left-eye video information held in the transmissive liquid crystal display panel 10 as a backlight is viewed only by the left eye EL.

Then, in the transmissive liquid crystal display panel 10, a switching period T _{R → L} (time t3 to time t4) from the right-eye video information to the left-eye video information, and from the left-eye video information to the right-eye video information. In each of the switching periods T _{L → R} (time t5 to time t6), both the right LED light source 11R and the left LED light source 11L are turned off. For this reason, even if the right-eye video information and the left-eye video information are partially mixed in these switching periods T _{R → L} and T _{L → R} , based on the mixed video information. The video is not visible to the user U.

Therefore, according to the above-described stereoscopic video display device, the switching period (TR _{→ L)} between the right-eye video information and the left-eye video information can be obtained without inserting a full black image as in the conventional device. , T _{L → R} ), the video based on the video information in which the right-eye video information and the left-eye video information are mixed in the transmissive liquid crystal display panel 10 is not seen by the user U. U uses the right-eye ER to display the video based on the right-eye video information formed on the transmissive liquid crystal display panel 10 and the left-based video based on the left-eye video information formed on the transmissive liquid crystal display panel 10. With the eye EL, it can be surely seen alternately at a predetermined cycle. Therefore, the user U recognizes a stereoscopic video based on the right-eye video information and the left-eye video information without any image quality deterioration due to the mixture of the right-eye video information and the left-eye video information. Can do. Then, since it is not necessary to insert the entire black image, the writing period of the right-eye video information and the left-eye video information to the transmissive liquid crystal display panel 10 (T _R + T _{R → L} + T _L + T _{L → R} ) However, it is possible to prevent the occurrence of flicker without being lengthened by the insertion of the entire black image.

Specifically, for example, using the transmissive liquid crystal display panel 10 capable of rewriting the screen at an operation speed of 8 msec. (120 Hz), each of the right-eye video and the left-eye video is, for example, human By controlling each period TR, TL, T _{R → L} , T _{L → R so} that the eyes can be switched to the transmissive liquid crystal display panel 10 at a frequency of 25 Hz or higher where flicker cannot be recognized, the user U can Thus, there is no occurrence of flicker and a stereoscopic image with good image quality can be viewed.

  Further, since the vertical diffusion plate 13 is disposed at a predetermined position in front of the transmissive liquid crystal display panel 10, the right eye region is emitted from the right LED light source 11R and passes through the convex lens plate 12 and the transmissive liquid crystal display panel 10. And the light that is emitted from the left LED light source 11L and travels toward the left eye region through the convex lens plate 12 and the transmissive liquid crystal display panel 10 is not substantially diffused in the lateral direction. Is diffused vertically. For this reason, mixing of the video for the right eye and the video for the left eye is prevented, and the user U (see FIGS. 1A and 1A) sets the viewpoint (position of the right eye and the left eye) in the vertical direction (up and down). ), The right-eye video can be reliably viewed with the right eye ER, and the left-eye video can be reliably viewed with the left eye EL.

  In the stereoscopic video apparatus described above, the light source unit 11 can be configured as shown in FIG.

  In FIG. 5, the light source unit 11 includes a right LED light source 11R and a left LED light source 11L. The right LED light source 11R is divided into a right main LED light source 11RM and a right auxiliary LED light source 11RS. Similarly, the left LED light source 11L is divided into a left main LED light source 11LM and a left auxiliary LED light source 11LS. The right main LED light source 11RM and the left main LED light source 11LM are in contact with a center line Lc passing through the centers of the transmissive liquid crystal display panel 10 and the convex lens plate 12, and are parallel to the transmissive liquid crystal display panel (convex lens plate 12). Has been placed. The right auxiliary LED light source 11RS extends outward from the end of the right main LED light source 11RM, and is inclined to the convex lens plate 12 side. The left auxiliary LED light source LS extends outward from the end portion of the left main LED light source 11LM and is inclined to the convex lens plate 12 side.

  More specifically, the light source unit 11 has a structure in which a plurality of (many) LEDs (light emitting diodes) are arranged in two rows in the upper and lower directions, similar to that shown in FIG. Then, the LED row is divided into four parts in the lateral direction, the two parts at the center are used as the right main LED light source 11RM and the left main LED light source 11LM, and the part following the outside of the right main LED light source 11RM is the right auxiliary. A portion that is used as the LED light source 11RS and continues to the outside of the left main LED light source 11LM is used as the left auxiliary LED light source 11LS.

  When the light source unit 11 having such a structure is used, light emitted from the right main LED light source 11RM and transmitted through the diffusion plate 14 travels to the right eye region by the convex lens plate 12, and is emitted from the right auxiliary LED light source 11RS and diffused. The light transmitted through 14 can travel to the right eye region through the periphery of the convex lens plate 12. Therefore, a person who is away from the user U who is viewing a stereoscopic image in the vicinity of the center line Lc and is in the right eye region cannot see a stereoscopic image, but a plane based on the right eye image information (two-dimensional ) You can see the video in a brighter state (with both eyes). Further, the light emitted from the left main LED light source 11LM and transmitted through the diffusion plate 14 travels to the left eye region by the convex lens plate 12, and the light emitted from the left auxiliary LED light source 11LS and transmitted through the diffusion plate 14 is the convex lens plate 12. Can proceed to the left eye region through the periphery of For this reason, even a person who is away from the user U and is in the left eye region cannot see a stereoscopic image, but a planar (two-dimensional) image based on the left eye image information is viewed in a brighter state (both eyes). But)

  The above-described stereoscopic video display apparatus can provide a planar (two-dimensional) video instead of the stereoscopic video with the optical system having the same configuration (see FIGS. 1A and 1B). In this case, the controller 20 reads the planar image information from the storage unit 22, and the planar image information is transmitted at the timing shown in FIG. 6 by the control of the controller 20 (planar image writing control unit and second light source control unit). The LCD panel 10 is continuously rewritten in units of frames, and the right LED light source 11R and the left LED light source 11L are alternately turned on (lighted) and turned off alternately.

Referring to FIG. 6, in the process in which flat image information is continuously rewritten in units of frames in the transmissive liquid crystal display panel 10, the rewrite period T _CHANGE (for example, time t3 to time t4, etc.) of flat image information in units of frames. Then, both the right LED light source 11R and the left LED light source are turned off. Further, based on the timing (for example, times t2 and t4) when the writing of the flat image information to the transmissive liquid crystal display panel 10 is completed, specifically, right after the timing when the writing of the flat image information is completed. Both the light LED source 11R and the left LED light source 11L are lit. Then, the state in which the flat image information is written and held in the transmissive liquid crystal display panel 10 is maintained for a period T _D (for example, time t2 to time t3, time t4 to time t5, etc.), and switching of the flat image information is started. Both the right LED light source 11R and the left LED light source 11L that have been turned on until just before the timing (for example, time t5) are turned off. Thereafter, in the same manner, in the process in which the plane image information is continuously rewritten in units of frames in the transmissive liquid crystal display panel 10, the right LED light source 11R and the left LED light source 11L are turned on and off alternately.

In the stereoscopic video display device that operates as described above (see FIG. 6), both the right LED light source 11R and the left LED light source 11L are turned off during the rewriting period T _CHANGE of the plane video information in units of frames. Even if the flat image information of the front and rear frames is partially mixed in the display panel 10, the user U views the image formed on the transmissive liquid crystal display panel 10 based on the flat image information. There is no. Further, in the period T _D plane image information on the transmission type liquid crystal display panel 10 is held written, since both of the right LED light source 11R and the left LED light source 11L is lit, the user U, the transmission type A plane image based on the plane image information formed on the liquid crystal display panel 10 can be reliably viewed with both the right eye ER and the left eye EL. That is, the user U can surely view a planar image instead of the above-described stereoscopic image without limiting the observation position.

  As described above, the above-described stereoscopic video display apparatus can provide both a stereoscopic video and a planar video using an optical system having the same configuration (see FIGS. 1A and 1B). That is, the user can view both a stereoscopic image and a planar image on the same display device.

  When displaying the planar image, the controller 20 controls the amount of light emitted from the right LED light source 11R and the left LED light source 11L to be smaller than that in the case of providing the stereoscopic image described above, specifically, to be halved. To do. Thereby, the brightness of the planar image that can be visually recognized by the light emitted from both the right LED light source 11R and the left LED light source 11L is recognized by the light emitted from either the right LED light source 11R or the left LED light source 11L. It comes close to the brightness of the obtained stereoscopic video (right-eye video and left-eye video). Therefore, when switching between the stereoscopic video and the planar video, it is possible to reduce the user's uncomfortable feeling due to the change in the brightness of the video.

In the case of displaying a flat image, both the right LED light source 11R and the left LED light source 11L are not turned off in the rewriting period T _CHANGE of the flat image information in units of frames, but are lit and maintained in a constantly lit state. It is also possible to do so (since a flat image is a frame-based image and does not change significantly). In this case, the amount of light emitted from each of the right LED light source 11R and the left LED light source 11L is controlled to be smaller than that in the case of providing a stereoscopic image, as described above.

In the above-described stereoscopic video display device, the video information for the right eye and the video information for the left eye are stored in the storage unit 22 in advance, but the video information for the right eye and the video for the left eye that are broadcast on television. Information may be used, or video information for the right eye obtained from a video camera for photographing the right eye field and video information for the left eye obtained from a video camera for photographing the left eye field may be used. The right-eye video information and the left-eye video information obtained by other methods may be used.
Further, the stereoscopic image display device according to the present invention is not limited to the above-described one, and can be appropriately changed within the scope described in the claims.

  As described above, the stereoscopic image display device according to the present invention has an effect that it is possible to prevent the image quality from being deteriorated without using the entire black image in the transmissive liquid crystal display panel. The present invention is useful as a stereoscopic image display device that provides an image that allows a stereoscopic image to be viewed without using special glasses such as glasses or polarized glasses.

DESCRIPTION OF SYMBOLS 10 Transmission type liquid crystal display panel 11 Light source unit 11R Right LED light source 11L Left LED light source 11RM Right main LED light source 11RS Right auxiliary LED light source 11LM Left main LED light source 11LS Left auxiliary LED light source 12 Convex lens plate (optical member)
13 Longitudinal diffusion plate (first diffusion member)
14 Diffusion plate (second diffusion member)
20 controller 21 drive circuit 22 storage unit 23R, 23L drive circuit

Claims (7)

A transmissive liquid crystal display panel;
A right light source and a left light source arranged side by side behind the transmissive liquid crystal display panel;
The transmissive liquid crystal display panel is disposed between the right light source and the left light source, and emits light from the right light source and passes through the transmissive liquid crystal display panel, and emits from the left light source and transmits the transmissive liquid crystal display. An optical member for separating and directing light passing through the panel into a right eye region and a left eye region;
Time-division video writing control means for sequentially and alternately writing video information for the right eye and video information for the left eye on the transmissive liquid crystal display panel;
The right light source and the left light source are turned off during the switching period from the right-eye video information to the left-eye video information in the transmissive liquid crystal display panel, and the left-eye video information is transferred to the transmissive liquid crystal display panel. The left light source is turned on based on the completion of the writing of the light, and the right light source and the left light source are turned off during the switching period from the left-eye video information to the right-eye video information in the transmissive liquid crystal display panel. And a first light source control unit that turns on the right light source based on a timing when writing of the right-eye video information to the transmissive liquid crystal display panel is completed.   The stereoscopic image display device according to claim 1, further comprising a first diffusion member that diffuses light transmitted through the transmissive liquid crystal display panel substantially only in a vertical direction.   The stereoscopic image display apparatus according to claim 1, further comprising a second diffusion member that diffuses light from the right light source and the left light source. The right light source includes a right main light source disposed in parallel to the transmissive liquid crystal display panel, and a right auxiliary light source disposed to be inclined from the end of the right main light source to the optical member side. And
The left light source includes a left main light source arranged in parallel to the transmissive liquid crystal display panel, and a left auxiliary light source provided to be extended outward from the end of the left main light source and inclined toward the optical member side. The stereoscopic video display device according to claim 1, comprising: Instead of switching display between the right-eye video information and the left-eye video information on the transmissive liquid crystal display panel, planar video writing control for continuously rewriting the planar video information on the transmissive liquid crystal display panel on a frame basis. Means,
In the transmissive liquid crystal display panel, the right light source and the left light source are turned off during a period in which the frame-based planar image information is rewritten, and the right light source and the left light source are turned on based on the completion of the rewriting of the planar image information. The stereoscopic image display device according to claim 1, further comprising: a second light source control unit that turns on the light source.   6. The stereoscopic image according to claim 5, wherein the second light source control means causes the first right light source control means to emit the front right light source and the left light source with a light amount smaller than a light amount when each of the right light source and the left light source is turned on. Display device.   The solid according to claim 6, wherein the second light source control unit causes the right light source and the left light source to emit light with a light amount that is half of a light amount when each of the right light source and the left light source is turned on by the first light source control unit. Video display device.

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