JP5465759B2 - Display device and driving method of display device - Google Patents

Description

  The present invention relates to a display device capable of visually recognizing a stereoscopic image and a driving method of the display device.

  In recent years, there has been proposed a display device (hereinafter also referred to as a stereoscopic image display device) that allows an observer to perceive an image displayed on a screen as a stereoscopic image without requiring special glasses. . One of the methods for making a stereoscopic image visible is a parallax barrier method (parallax barrier method). In the parallax barrier method, the right-eye image and the left-eye image are alternately displayed in a stripe pattern on the display panel, and the right-eye image and the left-eye image are provided on the front surface (observer side) of the display panel. This is a method of recognizing a three-dimensional image by separating an opening and a light-shielding portion with a barrier sheet in which stripes are alternately arranged and allowing an observer to observe (for example, Patent Documents 1 and 2).

  The principle of the conventional stereoscopic image display device will be described below. In the following, a so-called three-viewpoint type stereoscopic image display device that can visually recognize three different images from three different viewpoints corresponding to the respective images will be described as an example.

  FIG. 29 is a plan view showing a pixel array of a display panel in a conventional stereoscopic image display device. FIG. 30 is a plan view illustrating an example of a barrier sheet in a conventional stereoscopic image display device. FIG. 31 is a schematic diagram showing the principle of display in a conventional stereoscopic image display device. FIG. 32A is a schematic diagram showing an image observed by the left eye in a conventional stereoscopic image display device, and FIG. 32B is a schematic diagram showing an image observed by the right eye. FIG. 31 shows the nth row of the display panel of FIG.

  In the three-viewpoint type stereoscopic image display device, as shown in FIG. 29, the pixels 1 to 3 are repeatedly arranged in this order in the row direction and the column direction on the display panel 112 to display different images. On the front surface of the display panel 112, a barrier sheet 113 including an opening 114 and a light shielding portion 115 shown in FIG. 30 is provided. The display image of the display panel 112 is separated by the barrier sheet 113 into an image 1 displayed on the pixel 1, an image 2 displayed on the pixel 2, and an image 3 displayed on the pixel 3. As shown in FIG. 31, the image 1 displayed on the pixel 1 is viewed from the viewpoint A, the image 2 displayed on the pixel 2 is viewed from the viewpoint B, and the image 3 displayed on the pixel 3 is viewed from the viewpoint C. Visible from.

  Here, for example, when the viewpoint A corresponds to the right eye of the specific observer and the viewpoint B corresponds to the left eye of the specific observer, the image 1 shown in FIG. 32A is the right eye of the observer. The image 2 shown in (b) of FIG. 32 is observed in the left eye of the observer. Thereby, the observer can recognize the three-dimensional image consisting of the images 1 and 2. In the case where the viewpoint A corresponds to the right eye of a specific observer and the viewpoint C corresponds to the left eye of the specific observer, from a position different from the position where the stereoscopic image composed of the images 1 and 2 can be viewed, A stereoscopic image composed of the images 1 and 3 can be recognized.

JP-A-8-331605 (published on December 23, 1996) JP 2005-86506 A (published March 31, 2005)

  Such a conventional parallax barrier type stereoscopic image display device is intended to allow an observer to visually recognize a stereoscopic image. Therefore, when a planar image (two-dimensional image) is displayed, the resolution decreases. Occurs.

  An example of the stereoscopic image display apparatus shown in FIG. 29 will be given. Since the front surface of the display panel 112 is provided with a barrier sheet 113 (see FIG. 30) in which 1/3 of the display area becomes the opening 114, it is 2/3 of the display area compared to a normal display panel. Becomes a non-display area. That is, in the conventional stereoscopic image display device of the parallax barrier method, the resolution of the planar image (two-dimensional image) becomes 1/3 compared with a normal display device. For this reason, when a planar image is displayed on a conventional stereoscopic image display device of the parallax barrier method, the display quality of the planar image is degraded.

  The present invention has been made in view of the above problems, and an object thereof is to improve the display quality of a planar image in a parallax barrier display device capable of visually recognizing a stereoscopic image.

  In order to solve the above problems, a display device of the present invention separates a display panel having a plurality of pixels and a plurality of display images displayed on the display panel, and outputs them in a plurality of directions corresponding to each of the display panels. A plurality of pixels, each of the plurality of pixels having a relatively low luminance at least in a certain gradation and a relatively low luminance. The barrier sheet includes an opening that allows the plurality of display images to pass in a plurality of directions corresponding to the plurality of display images, and a light-shielding portion that blocks the passage of the plurality of display images. When viewing one display image corresponding to this from one direction, the unit overlaps the first sub-pixel displaying the display image on the barrier sheet and the top of each pixel on the barrier sheet. And at least a part of the portion overlapping the second subpixel, that is provided the constitution.

  Since the display device performs display with bright subpixels and dark subpixels in each pixel, so-called multi-pixel driving is realized.

  Further, according to the above configuration, for example, when the display image 1 is viewed from one direction (viewpoint A), the opening portion overlaps the bright subpixel 1 corresponding to the display image 1 and a plurality of display images. 2 and 3 and the portions overlapping the respective dark subpixels 2 and 3. Since the dark subpixels 2 and 3 have low luminance, when viewed from the viewpoint A, the same state as when light is blocked is obtained. Therefore, from the viewpoint A, only the display image 1 by the bright subpixel 1 is recognized. Similarly, when viewed from the viewpoint B, for example, only the display image 2 by the bright subpixel 2 is recognized. In this way, a stereoscopic image can be recognized.

  Furthermore, in the above configuration, the dark subpixels 2 and 3 can be observed from the viewpoint A through the opening. Therefore, the number of pixels contributing to display when displaying a planar image can be increased as compared with the conventional configuration. Therefore, since the effective display area excluding the non-display area can be made larger than the conventional configuration, the display quality of the planar image can be improved.

  In the display device, the opening includes a display image displayed on the first subpixel corresponding to each of the plurality of directions and a plurality of displays displayed on the second subpixel of each pixel. It can also be set as the structure provided in the said barrier sheet so that at least one part of an image may pass.

  In the display device, the display panel includes a right-eye pixel that displays a right-eye image and a left-eye pixel that displays a left-eye image, and the barrier sheet displays the right-eye image. In the display direction, the right-eye image and at least a part of the left-eye image displayed on the second subpixel included in the left-eye pixel are passed, while the left-eye image is The left-eye image and at least a part of the right-eye image displayed on the second subpixel included in the right-eye pixel may be passed in the display direction.

  In the display device, the first subpixel and the second subpixel may be alternately arranged in a scanning signal line extending direction and a scanning direction.

In the display device, the high luminance region represented by the first subpixel and the low luminance region represented by the second subpixel are arranged in the extending direction of the scanning signal line, respectively.
The high brightness area and the low brightness area may be arranged alternately in the scanning direction.

  In the display device, the barrier sheet may be configured to separate and output at least three images displayed on the display panel in three directions corresponding to the images.

  In the display device, the display panel includes a plurality of first pixels for displaying the first image, a plurality of second pixels for displaying the second image, and a plurality of third pixels for displaying the third image. The plurality of first to third pixels may be arranged repeatedly in this order in the extending direction of the scanning signal line and the scanning direction.

  In the display device, when the display panel displays a plurality of different display images, the plurality of second sub-pixels may function as the light shielding unit.

  In the display device, when the display panel displays a single display image, the opening may be configured to display according to the area gradation of the plurality of first and second subpixels. .

  In the display device, a pixel electrode is provided for each sub-pixel, and a storage capacitor line is provided corresponding to each pixel electrode, and the luminance of each sub-pixel is controlled by a storage capacitor line signal given to each storage capacitor line. It can also be set as a structure.

  In the above display device, the storage capacitor wiring signal given to one storage capacitor wiring does not level shift during writing of the signal potential to the pixel electrode forming the storage capacitor wiring and the capacitor, and the writing ends. The level can be shifted in the plus direction or the minus direction with respect to the reference potential in synchronism or thereafter.

  In the display device described above, the level shift direction is reversed between one of the two pixel electrodes included in one pixel and the storage capacitor wiring that forms a capacitor, and the other and the storage capacitor wiring that forms a capacitor. It can also be.

  The display device has a configuration in which one pixel electrode included in one of two pixels adjacent in the scanning direction and one pixel electrode included in the other form the same storage capacitor line and capacitor. You can also.

The display device driving method of the present invention separates a display panel having a plurality of pixels each including the first and second subpixels and a plurality of display images displayed on the display panel, and corresponds to each of them. A driving method of a display device including a barrier sheet capable of outputting in a plurality of directions, wherein in each pixel, the first sub-pixel has a relatively high luminance at least in a certain gradation. The second subpixel is displayed so that the luminance is relatively low;
In each of the plurality of directions, a display image displayed on the first subpixel corresponding to each direction, and at least a part of the plurality of display images displayed on the second subpixel of each pixel; Is output.

  Thereby, the effect similar to the effect show | played by the structure of the said display apparatus can be acquired.

  In the driving method of the display device, the display panel includes a right-eye pixel that displays a right-eye image and a left-eye pixel that displays a left-eye image, and displays the right-eye image. In the direction, the right-eye image and at least a part of the left-eye image displayed on the second sub-pixel included in the left-eye pixel are output, while the left-eye image is displayed. The left eye image and at least a part of the right eye image displayed on the second subpixel included in the right eye pixel may be output in the direction.

  In the display device of the present invention, the opening overlaps the first sub-pixel displaying the display image on the barrier sheet when viewing the one display image corresponding to the opening from one direction, It is the structure provided in at least one part of the part which overlaps with the said 2nd subpixel of each pixel in the said barrier sheet | seat.

  The display device driving method according to the present invention includes a display image displayed on the first subpixel corresponding to each direction and a plurality of display images displayed on the second subpixel of each pixel in each of the plurality of directions. This is a method for outputting at least a part of the display image.

  According to the above configuration and the driving method, it is possible to improve the display quality of a planar image in a parallax barrier display device capable of visually recognizing a stereoscopic image.

It is a perspective view which shows schematic structure of the liquid crystal display device which concerns on this Embodiment. FIG. 2 is a plan view illustrating an example of a pixel array of a liquid crystal panel in the liquid crystal display device of FIG. 1. It is a top view which shows an example of the pixel arrangement | sequence of the liquid crystal panel in the liquid crystal display device of a 3 viewpoint system which concerns on this Embodiment. It is a top view which shows the structure of the barrier sheet corresponding to the liquid crystal panel shown in FIG. 4A and 4B are schematic diagrams illustrating a display principle in the liquid crystal display device according to the present embodiment, in which FIG. 3A is a cross-sectional view of the a-th row of the liquid crystal panel illustrated in FIG. 3, and FIG. The cross section of the b line of a panel is shown. In the schematic diagram shown in FIG. 5, (a) shows an image observed with the left eye of the observer, and (b) shows an image observed with the right eye of the observer. (A) is a top view which shows typically the display state of 2D image in the conventional display apparatus, (b) shows typically the display state of 2D image in the liquid crystal display device which concerns on this Embodiment. It is a top view. 10 is a plan view illustrating an example of a pixel arrangement of a liquid crystal panel in a three-viewpoint type liquid crystal display device according to Modification 1. FIG. It is a top view which shows the structure of the barrier sheet corresponding to the liquid crystal panel shown in FIG. It is a schematic diagram which shows the principle of the display in the liquid crystal display device which concerns on the modification 1, (a) shows the cross section of the a line of the liquid crystal panel shown in FIG. 8, (b) shows the liquid crystal panel shown in FIG. The cross section of the b-th row is shown. In the schematic diagram shown in FIG. 10, (a) shows an image observed by the left eye of the observer, and (b) shows an image observed by the right eye of the observer. (A) is a top view which shows typically the display state of 2D image in the conventional display apparatus, (b) is a plane which shows typically the display state of 2D image in the liquid crystal display device which concerns on the modification 1. As shown in FIG. FIG. 12 is a plan view illustrating an example of a pixel arrangement of a liquid crystal panel according to Modification 2. FIG. 11 is a plan view illustrating an example of a pixel arrangement of a liquid crystal panel in a four-viewpoint type liquid crystal display device according to Modification 2. FIG. It is a top view which shows the structure of the barrier sheet corresponding to the liquid crystal panel shown in FIG. It is a schematic diagram which shows the principle of the display in the liquid crystal display device which concerns on the modification 2, (a) shows the cross section of the a line of the liquid crystal panel shown in FIG. 14, (b) shows the liquid crystal panel shown in FIG. The cross section of the b-th row is shown. In the schematic diagram shown in FIG. 16, (a) shows an image observed with the left eye of the observer, and (b) shows an image observed with the right eye of the observer. (A) is a top view which shows typically the display state of 2D image in the conventional display apparatus, (b) is a plane which shows typically the display state of 2D image in the liquid crystal display device which concerns on the modification 2. As shown in FIG. FIG. 12 is a plan view illustrating an example of another pixel arrangement of a liquid crystal panel according to Modification 2. FIG. 1 is a plan view illustrating a schematic configuration of a liquid crystal display device according to Embodiment 1. FIG. FIG. 21 is a plan view illustrating a schematic configuration of two pixels adjacent in the column direction in the liquid crystal display device illustrated in FIG. 20. It is a figure which shows the circuit structure of each pixel in the liquid crystal display device shown in FIG. FIG. 2 schematically shows a connection relationship between a pixel and a storage capacitor line in the liquid crystal display device according to the first embodiment, and also includes a source signal voltage writing polarity (+ − in the drawing) and two sub-pixels (light hatching in the drawing). It is a figure which shows typically arrangement | positioning of (dark subpixel). FIG. 6 is a diagram illustrating waveforms of signal voltages in the liquid crystal display device according to the first embodiment. FIG. 6 is a diagram illustrating an arrangement of writing polarities of source signal voltages in an N frame and an N + 1 frame when the liquid crystal display device according to the first embodiment is driven in a source line inversion. FIG. 6 is a diagram illustrating signal waveforms when the liquid crystal display device according to the first embodiment is driven in a source line inversion. 6 is a plan view illustrating a schematic configuration of a liquid crystal panel in a liquid crystal display device according to Embodiment 2. FIG. It is a circuit diagram which shows a part of liquid crystal panel of FIG. It is a top view which shows the pixel arrangement | sequence of the display panel in the conventional stereo image display apparatus. It is a top view which shows an example of the barrier sheet in the conventional stereoscopic image display apparatus. It is a schematic diagram which shows the principle of the display in the conventional stereoscopic image display apparatus. (A) is a schematic diagram which shows the image observed with the left eye in the conventional stereo image display apparatus, (b) is a schematic diagram which shows the image observed with the right eye.

  An embodiment of the present invention will be described with reference to the drawings.

  In addition to the function of displaying a planar image (two-dimensional image), the display device of the present invention can allow an observer to perceive an image displayed on the screen as a stereoscopic image (hereinafter referred to as a stereoscopic image). It has a function.

  FIG. 1 is a perspective view showing a schematic configuration of a liquid crystal display device (display device) 1 according to the present embodiment. The liquid crystal display device 1 includes a backlight 11, a liquid crystal panel (display panel) 12, and a barrier sheet 13 in order from the back side (the side opposite to the observer side) of the liquid crystal display device 1.

  The backlight 11 is disposed on the back side of the liquid crystal panel 12 and irradiates the liquid crystal panel 12 with light. The backlight 11 includes, for example, an LED as a light source and a light guide plate for guiding light emitted from the LED to the liquid crystal panel 12. The configuration of the backlight 11 is not limited to this, and a known configuration can be applied.

  The liquid crystal panel 12 includes an insulating active matrix substrate made of glass or the like and a light-transmitting counter substrate (color filter substrate) made of glass or the like disposed opposite to the active matrix substrate at a predetermined interval. ) And a liquid crystal layer sandwiched between the active matrix substrate and the counter substrate. As the liquid crystal layer, various types of liquid crystal layers can be used.

  The liquid crystal panel 12 is provided with a data signal line extending in the column direction (scanning direction), a scanning signal line extending in the row direction and a storage capacitor wiring, and pixels arranged in the row and column directions. Various signal lines are provided on the active matrix substrate.

  In the liquid crystal panel 12, each pixel has the same configuration, and one pixel includes at least two subpixels. One sub-pixel is provided with at least one pixel electrode. One data signal line, one scanning signal line, and one storage capacitor line are provided for each pixel. Two data signal lines may be provided for each pixel.

  Two subpixels included in one pixel are composed of a bright subpixel having relatively high luminance and a dark subpixel having relatively low luminance. One pixel displays a halftone according to the area gradation of these bright subpixels and dark subpixels. That is, the liquid crystal display device 1 has a multi-pixel structure (pixel division structure) and displays an image by a multi-drive method (also referred to as a pixel division method). As a driving method of the multi-drive method in the liquid crystal display device 1, a known method can be applied. A specific configuration and driving method of the liquid crystal display device 1 will be described later.

  FIG. 2 is a plan view showing an example of the pixel arrangement of the liquid crystal panel 12. As shown in FIG. 2, the bright sub-pixels and the dark sub-pixels (pixels shown by hatching in FIG. 2) are alternately arranged in the row direction and the column direction, and the entire liquid crystal panel 12 forms a checkered pattern.

  The barrier sheet 13 is provided on the front side (observer side) of the liquid crystal panel 12 and is bonded with a resin material so that the surface of the barrier sheet 13 and the display surface of the liquid crystal panel 12 are parallel to each other. . The barrier sheet 13 includes an opening 14 that allows a display image (for example, an image for the left eye and an image for the right eye) that is output from the liquid crystal panel 12 to pass therethrough, and a light shielding portion 15 that blocks the passage of the display image. The opening 14 and the light shielding portion 15 are formed corresponding to the pixel arrangement of the liquid crystal panel 12.

  Here, in the present embodiment, the liquid crystal display device 1 is a so-called three-viewpoint type liquid crystal display device in which three different images can be viewed from three different viewpoints corresponding to the respective images. The liquid crystal display device 1 is not limited to the three-viewpoint method, and may be a two-viewpoint method or a multi-viewpoint method such as a four-viewpoint method.

  FIG. 3 is a plan view showing an example of a pixel arrangement of the liquid crystal panel 12 in the three-viewpoint type liquid crystal display device 1. As shown in FIG. 3, in the liquid crystal panel 12, the pixels 1 to 3 are repeatedly arranged in this order in the row direction and the column direction, and three different images are displayed. Pixels 1 to 3 include a bright subpixel and a dark subpixel, respectively. That is, as shown in FIG. 3, in the row direction of the liquid crystal panel 12, from the left to the right, the bright subpixel 1, the dark subpixel 2, the bright subpixel 3, the dark subpixel 1, the bright subpixel 2, and the dark subpixel. The sub-pixels 3 are repeatedly arranged in this order. In the liquid crystal panel 12, the bright subpixel 1, the dark subpixel 1, the bright subpixel 2, the dark subpixel 2, and the bright subpixel 1 are arranged in one of two adjacent columns from the upper side to the lower side (vertical direction and column direction). The sub-pixel 3 and the dark sub-pixel 3 are repeatedly arranged in this order, and the other side includes the dark sub-pixel 1, the bright sub-pixel 1, the dark sub-pixel 2, the bright sub-pixel 2, the dark sub-pixel 3, and the bright sub-pixel. Pixels 3 are repeatedly arranged in this order. Thus, in the liquid crystal panel 12, the bright subpixels and the dark subpixels are arranged in a checkered pattern as a whole.

  FIG. 4 is a plan view showing the configuration of the barrier sheet 13 corresponding to the liquid crystal panel 12 shown in FIG. The opening 14 and the light shielding portion 15 are formed corresponding to the pixel arrangement of the liquid crystal panel 12 shown in FIG.

(About display of 3D image (3D image))
The display principle of the stereoscopic image of the liquid crystal display device 1 will be described.

  5A and 5B are schematic views showing the principle of display in the liquid crystal display device 1. FIG. 5A shows a cross section of the a-th row of the liquid crystal panel 12 shown in FIG. 3, and FIG. 5B shows the liquid crystal shown in FIG. The cross section of the b-th line of the panel 12 is shown. 6A is a schematic diagram illustrating an image observed with the left eye of the observer, and FIG. 6B is a schematic diagram illustrating an image observed with the right eye of the observer.

  The display image of the liquid crystal panel 12 is separated into an image 1 displayed on the pixel 1, an image 2 displayed on the pixel 2, and an image 3 displayed on the pixel 3 by the barrier sheet 13 shown in FIG. . Then, as shown in FIG. 5, the image 1 displayed on the pixel 1 is viewed from the viewpoint A, the image 2 displayed on the pixel 2 is viewed from the viewpoint B, and the image 3 displayed on the pixel 3 is viewed from the viewpoint C. Visible from.

  For example, when the viewpoint A corresponds to the left eye of a specific observer and the viewpoint B corresponds to the right eye of the specific observer, the image 1 shown in FIG. 6A is observed by the left eye of the observer. The image 2 shown in FIG. 6B is observed by the right eye of the observer. Thereby, the observer can recognize the three-dimensional image consisting of the images 1 and 2. In addition, when the viewpoint B corresponds to the left eye of a specific observer and the viewpoint C corresponds to the right eye of the specific observer, from a position different from the position where the stereoscopic image composed of the images 1 and 2 can be viewed, A stereoscopic image composed of the images 2 and 3 can be recognized.

  In the liquid crystal display device 1, as shown in FIGS. 5A and 5B, the barrier sheet 13 is located on a straight line connecting the viewpoint A and the pixel 1 (the bright subpixel 1 and the dark subpixel 1). An opening 14 is provided in the portion, the portion located on the straight line connecting the viewpoint A and the dark subpixel 2, and the portion located on the straight line connecting the viewpoint A and the dark subpixel 3. That is, an opening 14 is formed in the barrier sheet 13 so that the pixel 1, the dark subpixel 2 and the dark subpixel 3 can be observed from the viewpoint A. It should be noted that the portion located on the straight line connecting the viewpoint A and the bright subpixel 2 (on the dotted lines in FIGS. 5A and 5B) and the straight line connecting the viewpoint A and the bright subpixel 3 (FIG. 5). A light shielding portion 15 is formed in a portion located on the dotted lines (a) and (b).

  Here, since the image 2 and the image 3 are displayed on the dark subpixel 2 and the dark subpixel 3, the image 2 and the image 3 can be observed from the viewpoint A. However, the present liquid crystal display device 1 has a multi-pixel structure, and the dark sub-pixel has a lower luminance than the bright sub-pixel. Therefore, particularly in the low gradation halftone, the dark subpixel does not contribute to the display and can function as the light shielding portion 15 of the barrier sheet 13. For this reason, in FIGS. 5A and 5B, the viewpoint A (left eye) is the same as the state in which only the pixel 1 (the bright subpixel 1 and the dark subpixel 1) is observed. Thereby, as shown to (a) of FIG. 6, the left eye of an observer observes the image 1 displayed on the pixel 1. FIG. In FIG. 6A, for convenience, the light shielding portion 15 of the barrier sheet 13 is shown in black, and the dark subpixels 1 to 3 are shown in gray.

  Similarly, the observable dark subpixel 1 and the dark subpixel 3 function as the light shielding portion 15 of the barrier sheet 13 at the viewpoint B in FIGS. Therefore, the viewpoint B (right eye) is the same as the state in which only the pixel 2 (the bright subpixel 2 and the dark subpixel 2) is observed. Thereby, as shown in FIG. 6B, the right eye of the observer observes the image 2 displayed on the pixel 2. In FIG. 6B, for the sake of convenience, the light shielding portion 15 of the barrier sheet 13 is shown in black, and the dark subpixels 1 to 3 are shown in gray.

  As described above, the observer can recognize a good stereoscopic image including the image 1 and the image 2. Thus, in the liquid crystal display device 1, since the dark sub-pixel of the liquid crystal panel 12 functions as the light shielding portion 15 of the barrier sheet 13, the area of the opening portion 14 of the barrier sheet 13 has a conventional configuration (see FIG. 30). It can be enlarged compared to. The advantages of this will be described below.

(About the display of planar images (2D images))
The display principle of the planar image of the liquid crystal display device 1 will be described.

  In the liquid crystal display device 1, when displaying a planar image, one image is displayed on all the pixels 1 to 3 by normal multi-pixel driving.

  Here, as shown in FIG. 4, the barrier sheet 13 provided on the front surface of the liquid crystal panel 12 has an opening 14 in about 2/3 of the display area of the liquid crystal panel 12. That is, the barrier sheet 13 has an opening ratio of about twice that of the conventional barrier sheet (the barrier sheet 113 in FIG. 30). Therefore, in the liquid crystal panel 12 according to the present embodiment, the number of pixels contributing to display can be increased approximately twice as compared with the conventional display panel (display panel 112 in FIG. 29). Therefore, in the liquid crystal display device 1 according to the present embodiment, it is possible to improve the display quality of the flat image as compared with the conventional liquid crystal display device.

  7A is a plan view schematically showing a display state of a 2D image in a conventional display device, and FIG. 7B is a plan view schematically showing a display state of a 2D image in the liquid crystal display device 1. FIG. Here, the character string “ABC” is shown as an example of the 2D image. As can be seen by comparing (a) and (b) of FIG. 7, according to the present liquid crystal display device 1, the character string “ABC” of the 2D image can be clearly recognized as compared with the conventional display device. It can be seen that the visibility is improved.

  The barrier sheet 13 is not limited to the configuration in which the openings 14 are provided in all portions located on a straight line connecting the viewpoints A to C and the dark subpixels 1 to 3. That is, the barrier sheet 13 only needs to be provided with the opening 14 at least at a part located on a straight line connecting the viewpoints A to C and the dark subpixels 1 to 3. The same applies to each of the following configurations.

(Modification 1)
A modification of the liquid crystal display device 1 will be described.

  In the liquid crystal panel 12 of FIG. 3, in each pixel, the bright subpixel and the dark subpixel are arranged in the column direction, but the pixel arrangement is not limited to this.

  FIG. 8 is a plan view showing an example of a pixel arrangement of the liquid crystal panel 12a in the three-viewpoint type liquid crystal display device 1a. As shown in FIG. 8, in the liquid crystal panel 12a, the pixels 1 to 3 are repeatedly arranged in this order in the row direction, and three different images are displayed. The pixels 1 to 3 include a bright subpixel and a dark subpixel arranged in the row direction, respectively.

  Specifically, as shown in FIG. 8, in the liquid crystal panel 12a, one of two adjacent rows (a-th row) has a bright and sub-pixel constituting the pixel 1 from the right side to the left side (horizontal direction, row direction). The pixel 1, the dark subpixel 1, the light subpixel 2 and the dark subpixel 2 constituting the pixel 2, and the light subpixel 3 and the dark subpixel 3 constituting the pixel 3 are arranged in this order. On the other of the two adjacent rows (the b-th row), from the right side to the left side (horizontal direction, row direction), the dark sub-pixel 1 and the bright sub-pixel 1 constituting the pixel 1, and the dark sub-pixel 2 constituting the pixel 2 The dark sub-pixel 3 and the bright sub-pixel 3 constituting the bright sub-pixel 2 and the pixel 3 are arranged in this order.

  Further, in the liquid crystal panel 12a, one of two adjacent columns has a bright subpixel 1, a dark subpixel 1, a bright subpixel 3, a dark subpixel 3, a bright subpixel from the upper side to the lower side (vertical direction, column direction). The sub-pixel 2 and the dark sub-pixel 2 are repeatedly arranged in this order, and the other side includes the dark sub-pixel 1, the bright sub-pixel 1, the dark sub-pixel 3, the bright sub-pixel 3, the dark sub-pixel 2, and the bright sub-pixel. Pixel 2 is repeatedly arranged in this order. Thus, in the liquid crystal panel 12, the bright subpixels and the dark subpixels are arranged in a checkered pattern as a whole.

  FIG. 9 is a plan view showing a configuration of a barrier sheet 13a corresponding to the liquid crystal panel 12a shown in FIG. The opening 14 and the light shielding portion 15 are formed corresponding to the pixel arrangement of the liquid crystal panel 12a shown in FIG.

(About display of 3D image (3D image))
The display principle of the stereoscopic image of the liquid crystal display device 1a according to Modification 1 will be described.

  10A and 10B are schematic views showing the principle of display in the liquid crystal display device 1a. FIG. 10A shows a cross section of the a-th row of the liquid crystal panel 12a shown in FIG. 8, and FIG. 10B shows the liquid crystal shown in FIG. The cross section of the b-th line of the panel 12a is shown. FIG. 11A is a schematic diagram showing an image observed by the left eye of the observer, and FIG. 11B is a schematic diagram showing an image observed by the right eye of the observer.

  The display image of the liquid crystal panel 12a is separated into an image 1 displayed on the pixel 1, an image 2 displayed on the pixel 2, and an image 3 displayed on the pixel 3 by the barrier sheet 13a shown in FIG. Then, as shown in FIG. 10A, in the a-th row, the image 1 displayed on the pixel 1 is viewed from the viewpoint A, the image 2 displayed on the pixel 2 is viewed from the viewpoint B, and the pixel 3 The image 3 displayed on the screen is visually recognized from the viewpoint C.

  For example, when the viewpoint A corresponds to the left eye of a specific observer and the viewpoint B corresponds to the right eye of a specific observer, the image 1 shown in FIG. The image 2 shown in FIG. 11B is observed by the right eye of the observer. Thereby, the observer can recognize the three-dimensional image consisting of the images 1 and 2. In addition, when the viewpoint C corresponds to the right eye of a specific observer and the viewpoint B corresponds to the left eye of the specific observer, from a position different from the position where the stereoscopic image composed of the images 1 and 2 can be visually recognized, A stereoscopic image composed of the images 2 and 3 can be recognized.

  In the liquid crystal display device 1a, as shown in FIGS. 10A and 10B, the barrier sheet 13a is located on a straight line connecting the viewpoint A and the pixel 1 (bright subpixel 1, dark subpixel 1). An opening 14 is provided in the portion, the portion located on the straight line connecting the viewpoint A and the dark subpixel 2, and the portion located on the straight line connecting the viewpoint A and the dark subpixel 3. That is, the opening 14 is formed in the barrier sheet 13a so that the pixel 1, the dark sub-pixel 2, and the dark sub-pixel 3 can be observed from the viewpoint A. Note that a portion located on a straight line connecting the viewpoint A and the bright subpixel 2 (on the dotted line in FIG. 10A) and a straight line connecting the viewpoint A and the bright subpixel 3 (FIG. 10A). The light shielding portion 15 is formed in a portion located on the dotted line).

  Here, the present liquid crystal display device 1a has a multi-pixel structure, and the dark sub-pixel has a lower luminance than the bright sub-pixel. Therefore, the dark sub-pixel can function as the light-shielding portion 15 of the barrier sheet 13a particularly in the low gradation halftone. Therefore, in FIGS. 10A and 10B, the viewpoint A (left eye) is the same as the state where only the pixel 1 (the bright subpixel 1 and the dark subpixel 1) is observed. Thereby, as shown to (a) of FIG. 11, the observer's left eye observes the image 1 displayed on the pixel 1. FIG. In FIG. 11A, for the sake of convenience, the light shielding portion 15 of the barrier sheet 13a is shown in black, and the dark subpixels 1 to 3 are shown in gray.

  Similarly, at the viewpoint B in FIGS. 10A and 10B, the observable dark subpixel 1 and the dark subpixel 3 function as the light shielding portion 15 of the barrier sheet 13a. For this reason, the viewpoint B (right eye) is the same as the state in which only the pixel 2 (the bright subpixel 2 and the dark subpixel 2) is observed. Thereby, as shown in FIG. 11B, the right eye of the observer observes the image 2 displayed on the pixel 2. In FIG. 11B, for the sake of convenience, the light shielding portion 15 of the barrier sheet 13a is shown in black, and the dark subpixels 1 to 3 are shown in gray.

  As described above, the observer can recognize a good stereoscopic image including the image 1 and the image 2.

(About the display of planar images (2D images))
The display principle of the planar image of the liquid crystal display device 1a according to Modification 1 will be described.

  In the liquid crystal display device 1a, when displaying a flat image, one image is displayed on all the pixels 1 to 3 by normal multi-pixel driving.

  Here, in the barrier sheet 13a provided on the front surface of the liquid crystal panel 12a, as shown in FIG. 9, about 2/3 of the display area of the liquid crystal panel 12a is the opening 14. That is, the barrier sheet 13a has an opening ratio of about twice that of the conventional barrier sheet (the barrier sheet 113 in FIG. 30). Therefore, in the liquid crystal panel 12a according to the first modification, the number of pixels contributing to display can be increased approximately twice as compared with the conventional display panel. Therefore, in the liquid crystal display device 1a according to the first modification, the effective display area excluding the non-display area can be made larger than that of the conventional configuration, so that the display quality of the planar image can be improved.

  12A is a plan view schematically showing a display state of a 2D image in a conventional display device, and FIG. 12B is a plan view schematically showing a display state of a 2D image in the liquid crystal display device 1a. FIG. The 2D image shows the character string “ABC” as in FIG. As can be seen by comparing FIGS. 12A and 12B, according to the present liquid crystal display device 1a, the character string “ABC” of the 2D image can be clearly recognized as compared with the conventional display device. It can be seen that the visibility is improved.

(Modification 2)
Another modification of the liquid crystal display device 1 will be described.

  In the above description, the case where the pixel arrangement of the liquid crystal panel 12 is a checkered pattern (see FIGS. 2 and 8) is taken as an example, but the pixel arrangement of the liquid crystal panel 12 is not limited to this.

  FIG. 13 is a plan view illustrating an example of a pixel array of the liquid crystal panel 12b according to the second modification. As shown in FIG. 13, the bright subpixels and the dark subpixels are arranged in the row direction, and the bright subpixels and the dark subpixels are alternately arranged in the column direction. That is, in the liquid crystal panel 12b, the bright subpixels and the dark subpixels are arranged in a horizontal stripe shape.

  In the above description, the three-viewpoint type liquid crystal display device 1 is taken as an example, but the liquid crystal display device 1 is not limited to this. Here, a four-viewpoint type liquid crystal display device 1b is taken as an example.

  FIG. 14 is a plan view showing an example of a pixel arrangement of the liquid crystal panel 12b in the four-viewpoint type liquid crystal display device 1b. As shown in FIG. 14, in the liquid crystal panel 12b, the pixels 1 to 4 are repeatedly arranged in this order in the row direction, and four different images are displayed. The pixels 1 to 4 each include a bright subpixel and a dark subpixel. That is, as shown in FIG. 14, in the liquid crystal panel 12b, one of the two adjacent rows (a-th row) has a bright sub-pixel 1, a bright sub-pixel 2, from the left to the right (horizontal direction, row direction), The bright subpixel 3 and the bright subpixel 4 are repeatedly arranged in this order. On the other side (the b-th row), the dark subpixel 1, the dark subpixel 2, the dark subpixel 3, and the dark subpixel 4 are displayed. It is repeatedly arranged in order. The liquid crystal panel 12b also has a bright subpixel 1, a dark subpixel 1, a bright subpixel 2, a dark subpixel 2, a bright subpixel 3, and a dark subpixel 3 from the upper side to the lower side (vertical direction, column direction). The bright subpixel 4 and the dark subpixel 4 are repeatedly arranged in this order.

  FIG. 15 is a plan view showing a configuration of a barrier sheet 13b corresponding to the liquid crystal panel 12b shown in FIG. The openings 14 and the light shielding portions 15 are formed corresponding to the pixel arrangement of the liquid crystal panel 12b shown in FIG.

(About display of 3D image (3D image))
The display principle of the stereoscopic image of the liquid crystal display device 1b according to Modification 2 will be described.

  16A and 16B are schematic views showing the principle of display in the liquid crystal display device 1b. FIG. 16A shows a cross section of the a-th row of the liquid crystal panel 12b shown in FIG. 14, and FIG. 16B shows the liquid crystal shown in FIG. The cross section of the b-th line of the panel 12b is shown. FIG. 17A is a schematic diagram showing an image observed by the left eye of the observer, and FIG. 17B is a schematic diagram showing an image observed by the right eye of the observer.

  The display image of the liquid crystal panel 12b is displayed on the image 1 displayed on the pixel 1, the image 2 displayed on the pixel 2, the image 3 displayed on the pixel 3, and the pixel 4 by the barrier sheet 13b shown in FIG. It is separated into an image 4 to be displayed. 16A, in the a-th row, the image 1 displayed on the pixel 1 is visually recognized from the viewpoint A, the image 2 displayed on the pixel 2 is visually recognized from the viewpoint B, and the pixel 3 3 is viewed from the viewpoint C, and the image 4 displayed on the pixels 4 is viewed from the viewpoint D.

  For example, when the viewpoint A corresponds to the right eye of a specific observer and the viewpoint B corresponds to the left eye of a specific observer, the image 1 shown in FIG. 17A is observed to the right eye of the observer. The image 2 shown in FIG. 17B is observed in the left eye of the observer. Thereby, the observer can recognize the three-dimensional image consisting of the images 1 and 2. In the case where the viewpoint C corresponds to the right eye of a specific observer and the viewpoint D corresponds to the left eye of the specific observer, from a position different from the position where the stereoscopic image composed of the images 1 and 2 can be viewed, A stereoscopic image composed of the images 3 and 4 can be recognized.

  In the liquid crystal display device 1b, as shown in FIGS. 16A and 16B, the barrier sheet 13b is located on a straight line connecting the viewpoint A and the pixel 1 (bright subpixel 1, dark subpixel 1). A straight line connecting a portion, a portion located on a straight line connecting the viewpoint A and the dark subpixel 2, a portion located on a straight line connecting the viewpoint A and the dark subpixel 3, and a straight line connecting the viewpoint A and the dark subpixel 4 An opening 14 is provided in the upper portion. That is, the opening 14 is formed in the barrier sheet 13b so that the pixel 1, the dark subpixel 2, the dark subpixel 3, and the dark subpixel 4 can be observed from the viewpoint A. It should be noted that the portion located on the straight line connecting the viewpoint A and the bright subpixel 2 (on the dotted line in FIG. 16A) and the straight line connecting the viewpoint A and the bright subpixel 3 (FIG. 16A). A light-shielding portion 15 is formed in a portion located on the dotted line) and a portion located on the straight line connecting the viewpoint A and the bright subpixel 4 (on the dotted line in FIG. 16A).

  Here, the present liquid crystal display device 1b has a multi-pixel structure, and the luminance of the dark sub-pixel is relatively lower than that of the bright sub-pixel. Therefore, the dark sub-pixel can function as the light-shielding portion 15 of the barrier sheet 13b, particularly in the low gradation halftone. Therefore, in FIGS. 16A and 16B, the viewpoint A (right eye) is the same as the state where only the pixel 1 (the bright subpixel 1 and the dark subpixel 1) is observed. Thereby, as shown to (a) of FIG. 17, the observer's right eye observes the image 1 displayed on the pixel 1. FIG. In FIG. 17A, for the sake of convenience, the light shielding portion 15 of the barrier sheet 13b is shown in black, and the dark subpixels 1 to 4 are shown in gray.

  Similarly, the observable dark subpixel 1, dark subpixel 2 and dark subpixel 4 function as the light shielding portion 15 of the barrier sheet 13b at the viewpoint B in FIGS. For this reason, in the viewpoint B (left eye), only the pixel 2 (the bright subpixel 2 and the dark subpixel 2) is observed. Thereby, as shown in FIG. 17B, the left eye of the observer observes the image 2 displayed on the pixel 2. In FIG. 17B, for the sake of convenience, the light shielding portion 15 of the barrier sheet 13b is shown in black, and the dark subpixels 1 to 4 are shown in gray.

  As described above, the observer can recognize a good stereoscopic image including the image 1 and the image 2.

(About the display of planar images (2D images))
The display principle of the planar image of the liquid crystal display device 1b according to Modification 2 will be described.

  In the liquid crystal display device 1b, when displaying a flat image, one image is displayed on all the pixels 1 to 4 by normal multi-pixel driving.

  Here, as shown in FIG. 15, the barrier sheet 13b provided on the front surface of the liquid crystal panel 12b has an opening of about 5/8 of the display area of the liquid crystal panel 12b. That is, the barrier sheet 13b has an aperture ratio of about 2.5 times that of a conventional barrier sheet (when the configuration of FIG. 30 is set to four viewpoints). Therefore, in the liquid crystal panel 12b according to the second modification, the number of pixels contributing to display can be increased by about 2.5 times compared to the conventional display panel. Therefore, in the liquid crystal display device 1b according to the second modification, the effective display area excluding the non-display area can be made larger than the conventional configuration, so that the display quality of the planar image can be improved.

  18A is a plan view schematically showing a display state of a 2D image in a conventional display device, and FIG. 18B is a plan view schematically showing a display state of a 2D image in the liquid crystal display device 1b. FIG. The 2D image shows the character string “ABC” as in FIG. As can be seen by comparing FIGS. 18A and 18B, according to the present liquid crystal display device 1b, the character string “ABC” of the 2D image can be clearly recognized as compared with the conventional display device. It can be seen that the visibility is improved.

  In the configuration of Modification 2, the bright subpixel and the dark subpixel are arranged in the row direction, and the bright subpixel and the dark subpixel are alternately arranged in the column direction (see FIG. 14). Although shown, the pixel arrangement is not limited to this, and the following configuration may be adopted. That is, as shown in FIG. 19, each pixel includes one bright subpixel and two dark subpixels, and in each pixel, the dark subpixel, the bright subpixel, and the dark subpixel are arranged in this order in the column direction. It can also be set as the structure currently provided. As described above, in the configuration in which the bright sub-pixels and the dark sub-pixels are arranged in a horizontal stripe shape, each of the bright sub-pixels and the dark sub-pixels is arranged in the extending direction of the scanning signal line and is represented by the bright sub-pixel. And a low luminance region (see FIG. 14) represented by one dark subpixel, or a low luminance region (see FIG. 19) represented by a plurality of dark subpixels adjacent in the column direction. , And can be arranged alternately in the column direction.

  Next, examples of a liquid crystal display device having a multi-pixel structure (pixel division structure) according to this embodiment will be described below. Hereinafter, the liquid crystal display devices 1, 1a, and 1b are collectively referred to as a liquid crystal display device LCD, and the liquid crystal panels 12, 12a, and 12b are collectively referred to as a liquid crystal panel LCP.

[Example 1]
20 is a plan view showing a schematic configuration of the liquid crystal display device LCD, FIG. 21 is a plan view showing a schematic configuration of two pixels adjacent in the column direction, and FIG. 22 shows a circuit configuration of each pixel. FIG.

  The liquid crystal display LCD includes a liquid crystal panel LCP, a source driver 120 (data signal line driving circuit) for supplying a source signal voltage to data signal lines (source bus lines) S1... (Hereinafter referred to as Si), A gate driver 130 (scanning signal line driving circuit) for supplying a gate signal voltage to scanning signal lines (gate bus lines) G1... (Hereinafter referred to as Gj), and a storage capacitor wiring (CS bus line) CS1. A CS control circuit 140 (holding capacity wiring driving circuit) for supplying a CS voltage (holding capacity wiring signal) to the source driver 120, a gate driver 130, and a display control circuit 150 for controlling the CS control circuit 140. .

  As shown in FIG. 22, the pixel P includes a first subpixel electrode 17a and a second subpixel electrode 17b. The first subpixel electrode 17a is connected to the scanning signal line Gj and the data signal line Si through the first transistor TFT1. The second subpixel electrode 17b is connected to the scanning signal line Gj and the data signal line Si through the second transistor TFT2. The counter electrode com is provided in common to the two subpixel electrodes, and is generally provided in common to all the pixels in the display area. A first liquid crystal capacitor Clc1 is formed between the first subpixel electrode 17a and the counter electrode com, and a second liquid crystal capacitor Clc2 is formed between the second subpixel electrode 17b and the counter electrode com. A first storage capacitor CS1 is formed between the first subpixel electrode 17a and the first storage capacitor line CS-A, and a first storage capacitor line CS-B is provided between the second subpixel electrode 17b and the second storage capacitor line CS-B. 2 holding capacitor CS2 is formed.

  The display control circuit 150 performs a display operation from an external signal source (for example, a tuner), a digital video signal Dv representing an image to be displayed, a horizontal synchronization signal HSY and a vertical synchronization signal VSY corresponding to the digital video signal Dv. A control signal Dc for control, and a data start pulse signal SSP as a signal for displaying an image represented by the digital video signal Dv on the liquid crystal panel LCP based on the signals Dv, HSY, VSY and Dc. A data clock signal SCK, a latch strobe signal LS, a signal POL for controlling the polarity of the data signal, a digital image signal DA representing an image to be displayed, a gate start pulse signal GSP, a gate clock signal GCK, and a gate driver output A control signal GOE is generated and output.

  More specifically, the video signal Dv is output from the display control circuit 150 as the digital image signal DA after timing adjustment or the like is performed in the internal memory as necessary, and corresponds to each pixel of the image represented by the digital image signal DA. A data clock signal SCK is generated as a signal composed of pulses, and a data start pulse signal SSP is generated as a signal that becomes high level (H level) only for a predetermined period every horizontal scanning period based on the horizontal synchronization signal HSY. Based on VSY, a gate start pulse signal GSP is generated as a signal that is high for a predetermined period every one frame period (one vertical scanning period), a gate clock signal GCK is generated based on the horizontal synchronization signal HSY, and a horizontal synchronization signal HSY is generated. And the latch strobe signal LS and the gated signal based on the control signal Dc. Generating a driver output control signal GOE.

  Of the signals generated in the display control circuit 150 as described above, the digital image signal DA, the latch strobe signal LS, the signal POL for controlling the polarity of the data signal, the data start pulse signal SSP, and the data clock signal SCK are sources. The gate start pulse signal GSP, the gate clock signal GCK, and the gate driver output control signal GOE are input to the driver 120.

  Based on the digital image signal DA, the data start pulse signal SSP, the data clock signal SCK, the latch strobe signal LS, and the signal POL for controlling the polarity of the data signal, the source driver 120 performs each horizontal scanning line of the image represented by the digital image signal DA Data signals are sequentially generated as analog voltages corresponding to the pixel values in each horizontal scanning period, and these data signals (display signal voltages) are respectively applied to the data signal lines Si.

  The CS control circuit 140 receives the gate clock signal GCK and the gate start pulse signal GSP. The CS control circuit 140 controls the waveform of the CS voltage. When a vibration voltage having a waveform that vibrates at a duty ratio of 1: 1 is used as the CS voltage, the position and width (or period) of vibration are controlled.

  The liquid crystal display device LCD performs display operation by multi-pixel driving as described above. That is, as shown in FIG. 22, a source signal voltage (display signal voltage) is supplied from the common data signal line Si to the first subpixel electrode 17a and the second subpixel electrode 17b, and then, After the transistors TFT1 and TFT2 are turned off, the voltages of the first storage capacitor line CS-A and the second storage capacitor line CS-B are changed to be different from each other. Accordingly, the voltages applied to the first liquid crystal capacitor Clc1 and the second liquid crystal capacitor Clc2 are different, and a bright subpixel and a dark subpixel are formed in one pixel. This configuration has an advantage that it is not necessary to increase the number of data signal lines and the number of source drivers for driving them because the source signal voltage is supplied from one data signal line to the two subpixel electrodes.

  Hereinafter, an example in which the source line inversion driving method is applied to the liquid crystal display device LCD will be described with reference to FIGS.

  In the liquid crystal display device LCD, for example, a source line inversion driving method is applied to multi-pixel driving, and gate bus line interlaced scanning driving (interlace driving) is performed. As a result, the power consumption of the source driver, that is, heat generation, can be suppressed, and a decrease in the charging rate can be suppressed even when the image writing frequency is increased to improve moving image performance. The driving method of the liquid crystal display device LCD is not limited to this.

  In the description of the interlaced scanning drive, an example is described in which odd-numbered rows are scanned first (even-numbered rows are interlaced) and then even-numbered rows are scanned. However, the order of interlaced scanning in the embodiment of the present invention is not limited thereto. It goes without saying that even rows may be scanned first (skipping over odd rows) and then odd rows may be scanned.

  FIG. 23 schematically shows the connection relationship between the pixel of the liquid crystal display device LCD and the storage capacitor wiring, and also includes the source signal voltage write polarity (+ − in the figure) and two bright and dark sub-pixels (hatching in the figure). It is a figure which shows typically arrangement | positioning of (dark subpixel), and has shown the state which performed the source line inversion drive. Gj to Gj + 3 are scanning signal lines, CS-A to CS-E are storage capacitor lines, and Si to Si + 3 are data signal lines. As shown in FIG. 23, in the liquid crystal display device LCD, the bright subpixels and the dark subpixels are arranged in a checkered pattern while the writing polarity for each column is constant.

  FIG. 24 shows the waveform of each signal voltage in the liquid crystal display device LCD, which is supplied in order from the top to the CS voltage Vcs-B supplied from the storage capacitor line CS-B and the i-th data signal line Si. Source signal voltage Vsi, gate signal voltage Vgj supplied to j-th scanning signal line Gj, two sub-pixels included in pixels connected to i-th data signal line Si and j-th scanning signal line Gj Voltage Vp-B (i, j) applied to the sub-pixel P-B (i, j) having a storage capacitor connected to the storage capacitor line CS-B, and supplied to the j-th scanning signal line Gj. Subpixel having a storage capacitor connected to the storage capacitor line CS-B among the two subpixels of the pixel connected to the gate signal voltage Vgj, the i-th data signal line and the j + 1-th scanning signal line Gj + 1 P−B (i, j + Voltage Vp-B (i applied to) shows a j + 1). In the figure, Vcom indicates the counter voltage, and Vpix1 and Vpix2 indicate the effective voltages of the sub-pixels.

  FIG. 25 shows the writing polarity of the source signal voltage of each pixel in two consecutive frames (N frame and N + 1 frame). In the liquid crystal display device LCD, gate bus line interlaced scanning driving (interlace driving) is performed together with source line inversion driving. Therefore, in FIG. 25, each frame is divided into two periods (first half frame and second half). 1 frame). The half frame may be expressed as “1/2 frame” or “F / 2”.

  FIG. 26 is a diagram showing how pixels are scanned in two consecutive frames. The source signal voltage supplied to the i-th data signal line Si and the first to nth rows are shown in FIG. The waveform of the gate signal voltage supplied to the scanning signal lines G1 to Gn up to the eye is schematically shown. Also in this figure, each frame is divided into two periods (first half frame and second half frame). In this specification, two periods included in a frame are referred to as subframes. In general, since one frame period corresponds to one vertical scanning period, a period corresponding to a subframe period is referred to as a sub vertical scanning period. Note that the lengths of the first subframe and the second subframe do not always coincide with each other.

  An example of a pixel scanning method will be described with reference to FIGS.

  In the first half frame (first sub-vertical scanning period) of the Nth frame, for example, a pixel in which the gate signal voltage Vgj changes from Vgl (low level) to a certain period Vgh (high level) on the scanning signal lines Gj in odd rows. Data write pulse Pw is sequentially applied. That is, the source signal voltage is written to all the odd-numbered pixels from the first row to the (n-1) th row.

  In the second half frame (second sub-vertical scanning period), the pixels in a plurality of even-numbered rows skipped in the first half frame are sequentially scanned. For example, the pixel data write pulse Pw in which Vgj changes from Vgl to Vgh for a certain period of time is sequentially applied to the scanning signal line Gj + 1 of even rows. That is, the source signal voltage is written in all even-numbered pixels from the second row to the n-th row.

  The polarity of the source signal voltage supplied to the data signal line Si is a positive source signal voltage (Vsp) with respect to the median value Vsc (generally approximately equal to Vcom) of the source signal voltage in the first half frame. The positive source signal voltage is also applied in the next half frame. The negative source signal voltage (Vsn) is applied to Vsc in the first half frame of the (N + 1) th frame, and the negative source signal voltage is also applied to the next half frame. The source signal voltage supplied to Si + 1 adjacent to the data signal line Si has a polarity opposite to that of the source signal voltage supplied to the data signal line Si. Similarly, the source signal voltage supplied to the data signal line Si + 2 has a polarity opposite to that of the source signal voltage supplied to Si + 1.

  The CS voltage Vcs-B supplied to the storage capacitor line CS-B is a vibration waveform whose polarity is inverted with respect to the voltage Vcom of the counter electrode at a constant period (for example, a rectangular shape having a duty ratio of 1: 1 as shown in the figure). Wave).

  Since the source signal voltage supplied to the data signal line Si when the gate signal voltage of the scanning signal line Gj is high is positive, the voltage of the sub-pixel P-B (i, j) is written with positive polarity. The CS voltage Vcs-B supplied to the storage capacitor line CS-B is a vibration waveform whose polarity is inverted with respect to the voltage Vcom of the counter electrode at a constant period (for example, a rectangular shape having a duty ratio of 1: 1 as shown in the figure). The first change in the oscillation voltage Vcs-B of the storage capacitor wiring CS-B after the gate signal voltage of the scanning signal line Gj becomes low is a drop (for example, in this case, from positive polarity to negative polarity). Therefore, the voltage of the sub-pixel P-B (i, j) drops due to the push-down action, and the effective voltage Vpix1 applied to the sub-pixel P-B (i, j) is Pw. The sub-pixel P-B (i, j) becomes a dark sub-pixel because the source signal voltage becomes lower than the written source signal voltage (the absolute value becomes smaller).

  On the other hand, since the signal voltage of the data signal line Si when the gate signal voltage of the scanning signal line Gj + 1 is high is also positive, the voltage of the sub-pixel P-B (i, j + 1) is also written with positive polarity. Since the first change of the oscillation voltage of the storage capacitor line CS-B after the gate signal voltage of the scanning signal line Gj + 1 becomes low is increased (for example, in this case, change from negative polarity to positive polarity), the subpixel P- The voltage of B (i, j + 1) rises due to the pushing action, and the effective voltage Vpix2 applied to the sub-pixel P-B (i, j + 1) is equal to or higher than the source signal voltage written by Pw (the absolute value is The subpixel P-B (i, j + 1) becomes a bright subpixel.

  In other words, the CS voltage is a sub-capacity associated with a storage capacitor line to which the CS voltage is supplied among the two sub-pixels of a pixel connected to the scanning signal line Gj selected in the first sub-vertical scanning period. A function of increasing or decreasing the effective voltage of the pixel, and a storage capacitor to which the CS voltage is supplied among the two subpixels of the pixel connected to the scanning signal line Gj + 1 selected in the second sub vertical scanning period It has a waveform in which the action of increasing or decreasing the effective voltage of the subpixel associated with the wiring is opposite to each other.

  As illustrated here, the polarity of the source signal voltage in the first sub-vertical scanning period and the second sub-vertical scanning period belonging to the same vertical scanning period includes two consecutive vertical scanning periods in which the polarity of the source signal voltage is different from each other. Are the same, the CS voltage is the scanning signal line in the second sub vertical scanning period from the time when the gate signal voltage supplied to the scanning signal line Gj changes from high to low in the first sub vertical scanning period. The polarity may be changed an odd number of times until the gate signal voltage supplied to Gj + 1 changes from high to low. In consideration of the dullness of the vibration waveform of the CS voltage, it is more preferable that the polarity inversion interval (1/2 of the vibration period) is 5H or more. Further, it is preferable to generate the gate-on pulse Pw as late as possible after the polarity of the CS voltage is reversed, and it is desirable to reverse the polarity of the CS voltage as soon as possible after the gate signal voltage is turned off.

  Here, an oscillating voltage having a waveform oscillating at a duty ratio of 1: 1 is used as the CS voltage. However, the present invention is not limited to this, and the polarity may be changed an odd number of times. .

[Example 2]
A liquid crystal display device LCD according to Example 2 will be described. FIG. 27 is a plan view showing a configuration of the liquid crystal LCP constituting the liquid crystal display device LCD according to the second embodiment, and FIG. 28 is an equivalent circuit diagram thereof. The active matrix substrate of the liquid crystal panel LCP according to the second embodiment includes transistors TFT1 and TFT2 connected to the scanning signal line Gj, and a transistor TFT3 connected to the scanning signal line Gj + 1 that is the next stage of the scanning signal line Gj. One pixel includes pixel electrodes 17a and 17b and three capacitor electrodes 18 to 20. The capacitor electrodes 18 to 20 are arranged in this order so as to overlap the storage capacitor line CSLj through the gate insulating film, and each of the capacitor electrodes 18 to 20 overlaps the pixel electrode 17b through the channel protective film, and the drain electrode of the transistor TFT3. 31 is connected to the capacitor electrode 19 via the lead-out wiring 32, the source electrode 33 of the transistor TFT3 is connected to the pixel electrode 17a via the contact hole, and the capacitor electrode 18 is electrically connected to the pixel electrode 17b via the contact hole 34. It is connected to the. The capacitor electrode 20 is connected to the pixel electrode 17a through the lead wiring 21 and the contact hole 22. Further, the common source electrode 23 of the transistors TFT1 and TFT2 is connected to the data signal line Si, the drain electrode 24 of the transistor TFT1 is connected to the capacitor electrode 20 through the lead-out wiring 25, and the drain electrode 26 of the transistor TFT2 has a contact hole. Via the pixel electrode 17b. Here, a storage capacitor between the pixel electrode 17a and the storage capacitor line CSLj is formed in an overlapping portion between the capacitor electrode 20 and the storage capacitor line CSLj, and a pixel electrode 17b and a storage capacitor are formed in an overlap portion between the capacitor electrode 18 and the storage capacitor line CSLj. A storage capacitor between the capacitor wirings CSLj is formed, and a coupling capacitor of the pixel electrode 17a and the pixel electrode 17b is formed in an overlapping portion between the capacitor electrode 19 and the pixel electrode 17b.

  In the liquid crystal display device LCD according to the second embodiment, the same signal potential Vs (data signal) is written to the pixel electrode 17a and the pixel electrode 17b during the ON period of the transistors TFT1 and TFT2. For example, if Vs is positive polarity, when the transistor TFT3 is turned on after the transistors TFT1 and TFT2 are turned off, the pixel electrode 17a and the capacitor electrode 19 are electrically connected, and the positive charge of the pixel electrode 17a is applied to the capacitor electrode 19. Move (positive charge discharge). As a result, the potential of the pixel electrode 17a decreases from Vs, while the potential of the pixel electrode 17b that forms the capacitor electrode 19 and the capacitor Cx (see FIG. 28) increases from Vs as the potential of the capacitor electrode 19 increases. To do. If Vs is negative polarity, when the transistor TFT3 is turned on after the transistors TFT1 and TFT2 are turned off, the pixel electrode 17a and the capacitor electrode 19 are electrically connected, and the negative charge of the pixel electrode 17a is applied to the capacitor electrode 19. Move (negative charge discharge). As a result, the potential of the pixel electrode 17a increases from Vs, while the potential of the pixel electrode 17b that forms the capacitor electrode 19 and the capacitor Cx (see FIG. 28) decreases from Vs as the potential of the capacitor electrode 19 decreases. To do.

  Therefore, if the potential of the pixel electrode 17a after the transistor TFT3 is turned off is Va and the potential of the pixel electrode 17b after the transistor TFT3 is turned off is Vb, | Vb | ≧ | Va | (for example, | Vb | , Vb and com potential = Vcom)), the subpixel including the pixel electrode 17a can be a dark subpixel and the subpixel including the pixel electrode 17b can be a bright subpixel.

  As described above, the liquid crystal display device LCD according to the present embodiment can realize multi-pixel driving by the configuration and driving method shown in Examples 1 and 2, for example.

(Other configuration examples)
Since the liquid crystal display device according to the present embodiment includes a barrier sheet that can separate a plurality of display images displayed on the display panel and output them in a plurality of directions corresponding to each of the display images. A display device for view display can also be realized. For example, when it is possible to observe different displays depending on whether the display panel is viewed from the left direction or the right direction, a dual view display device can be realized. That is, the present liquid crystal display device can be applied to a display device capable of switching between 2D images and 3D images, and a display device capable of switching between 2D images and multi-view images.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  The present invention is suitable for a display device that can visually recognize a stereoscopic image.

1, 1a, 1b Liquid crystal display device (display device)
12, 12a, 12b Liquid crystal panel 13, 13a, 13b Barrier sheet 14 Opening portion 15 Light shielding portion LCD Liquid crystal display device (display device)
LCP Liquid crystal panel P Pixel 120 Source driver (data signal line drive circuit)
130 Gate driver (scanning signal line driving circuit)
140 CS control circuit (retention capacitor wiring drive circuit)
150 Display control circuit

Claims (15)

A display device comprising: a display panel having a plurality of pixels; and a barrier sheet capable of separating a plurality of display images displayed on the display panel and outputting the images in a plurality of directions corresponding to the display images. ,
Each of the plurality of pixels includes at least a first sub-pixel having a relatively high luminance at a certain gradation and a second sub-pixel having a relatively low luminance,
The barrier sheet includes an opening that allows the plurality of display images to pass in a plurality of directions corresponding to each of the barrier sheets, and a light-shielding portion that blocks the passage of the plurality of display images.
The opening has a portion overlapping the first sub-pixel displaying the display image on the barrier sheet when one display image corresponding to the opening is viewed from one direction, and each pixel in the barrier sheet. A display device, wherein the display device is provided on at least a part of a portion overlapping the second subpixel.   The opening is at least one of a display image displayed on the first subpixel corresponding to each of the plurality of directions and a plurality of display images displayed on the second subpixel of each pixel. The display device according to claim 1, wherein the display device is provided on the barrier sheet so that a part of the barrier sheet passes. The display panel includes a right-eye pixel that displays a right-eye image and a left-eye pixel that displays a left-eye image.
The barrier sheet is configured to display the right-eye image and at least a part of the left-eye image displayed on the second subpixel included in the left-eye pixel in a direction in which the right-eye image is displayed. The left-eye image and at least a part of the right-eye image displayed on the second subpixel included in the right-eye pixel in a direction in which the left-eye image is displayed. The display device according to claim 1, wherein the display device is passed.   The display device according to claim 1, wherein the first subpixel and the second subpixel are alternately arranged in a scanning signal line extending direction and a scanning direction. Each of the first subpixel and the second subpixel is arranged in the extending direction of the scanning signal line, and
4. The high luminance region represented by the first subpixel and the low luminance region represented by the second subpixel are alternately arranged in the scanning direction. The display device according to claim 1.   The display according to claim 1, wherein the barrier sheet outputs at least three images displayed on the display panel separately in three directions corresponding to the images. apparatus. The display panel includes a plurality of first pixels that display a first image, a plurality of second pixels that display a second image, and a plurality of third pixels that display a third image,
The display device according to claim 6, wherein the plurality of first to third pixels are repeatedly arranged in this order in the extending direction of the scanning signal line and the scanning direction.   8. The display according to claim 1, wherein when the display panel displays a plurality of different display images, the plurality of second sub-pixels function as the light-shielding portion. 9. apparatus.   8. The display according to claim 1, wherein, when the display panel displays a single display image, display is performed by area gradation of the plurality of first and second sub-pixels in the opening. The display device according to any one of the above.   A pixel electrode is provided for each sub-pixel, and a storage capacitor wiring is provided corresponding to each pixel electrode, and the luminance of each sub-pixel is controlled by a storage capacitor wiring signal given to each storage capacitor wiring. The display device according to any one of claims 1 to 9.   The storage capacitor wiring signal given to one storage capacitor wiring does not shift in level during the writing of the signal potential to the storage capacitor wiring and the pixel electrode forming the capacitor, or in synchronization with the end of the writing. 11. The display device according to claim 10, wherein after that, the level is shifted in the plus direction or the minus direction with respect to the reference potential.   The level shift direction is reversed between one of two pixel electrodes included in one pixel and a storage capacitor wiring that forms a capacitor, and the other and a storage capacitor wiring that forms a capacitor. Item 12. The display device according to Item 11.   11. The pixel electrode included in one of two pixels adjacent in the scanning direction and the pixel electrode included in the other form the same storage capacitor line and capacitor. The display device described. A display panel having a plurality of pixels each including the first and second sub-pixels and a plurality of display images displayed on the display panel can be separated and output in a plurality of directions corresponding to each of them. A driving method of a display device including a barrier sheet,
In each pixel, the first subpixel is displayed so that the luminance at least in a certain gradation is relatively high, and the second subpixel is displayed so that the luminance is relatively low,
In each of the plurality of directions, a display image displayed on the first subpixel corresponding to each direction, and at least a part of the plurality of display images displayed on the second subpixel of each pixel; Is output, and a method for driving the display device. The display panel includes a right-eye pixel that displays a right-eye image and a left-eye pixel that displays a left-eye image.
Outputting the right-eye image and at least a part of the left-eye image displayed on the second sub-pixel included in the left-eye pixel in a direction in which the right-eye image is displayed; Outputting the left-eye image and at least a part of the right-eye image displayed on the second sub-pixel included in the right-eye pixel in a direction in which the left-eye image is displayed. The method for driving a display device according to claim 14, wherein:

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